The best car seats for extended rear-facing are the Graco Extend2Fit 2-in-1, the Diono Radian 3R, and the Britax One4Life, because each one rear-faces a child to 50 lb instead of stopping at 40. The Graco Extend2Fit adds a 4-position panel that extends the seat by up to 5 inches of leg room, which is the single feature that keeps tall toddlers comfortable facing backwards past their fourth birthday.
Extended rear-facing means keeping your child in a convertible or all-in-one seat facing the rear window until they reach that specific seat’s rear-facing weight or height limit. For most children that milestone lands between ages 4 and 5, not age 2, which surprises a lot of parents who assume the switch happens at two.
We compared eight seats rated for extended rear-facing use, checking published rear-facing weight limits, height limits, install methods, and how each one handles the awkward years when a child’s knees are folded up. If you are still shopping for your first convertible, our convertible car seat roundup covers the earlier stage of the journey.
Table of Contents
Top 3 Picks for Extended Rear-Facing (October 2026)
Our best overall, best value, and best three-across picks all share one trait: a 40 lb or higher rear-facing ceiling and an install that survives a growing child. The Graco takes the top slot on strength of ratings volume and its extension panel, the Safety 1st wins on stage coverage for less, and the Diono is the only narrow seat here that still rear-faces to 50 lb.
Graco Extend2Fit 2-in-1
- Rear-facing harness 4-50 lb
- Extend2Fit 4-position panel adds up to 5 inches of leg room
- No-Rethread Simply Safe Adjust harness
- Machine-washable removable seat pad
Safety 1st Grow and Go
- 3-in-1: rear-facing 5-40 lb
- forward harness 30-65 lb
- booster 40-100 lb
- QuickFit harness
- Washer-and-dryer-safe pad
Diono Radian 3R
- Rear-facing up to 50 lb
- Slim profile fits three across
- Steel-reinforced shell
- 4 modes from birth to booster
- Folds flat and is airline approved
Quick Comparison of the Best Car Seats for Extended Rear-Facing in 2026
Every seat below rear-faces beyond the 40 lb mark that trips up most parents. Four reach 50 lb rear-facing, and the difference between a 40 lb and a 50 lb ceiling is often a full extra year with your child facing backwards.
| Product | Specifications | Action |
|---|---|---|
| Graco Extend2Fit 2-in-1 Convertible Car Seat |
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| Safety 1st Grow and Go All-in-One |
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| Diono Radian 3R 3-in-1 Convertible |
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 Graco 4Ever DLX 4-in-1 Convertible |
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 Graco Slimfit 3-in-1 Convertible |
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 Britax One4Life All-in-One Car Seat |
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 Evenflo Revolve360 Extend All-in-One |
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 Britax Poplar S Convertible Car Seat |
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Check Latest Price |
1. Graco Extend2Fit 2-in-1 — Best Overall for 50 lb Extended Rear-Facing
Graco Extend2Fit 2-in-1 Convertible Car Seat, Gotham
Rear-facing harness 4-50 lb
Forward harness 26.5-65 lb
4-position panel adds up to 5 inches
Side and frontal impact engineered
Pros
- Extension panel adds real leg room for longer rear-facing
- One-motion harness and headrest adjustment
- Installs in a mid-size SUV and moves between vehicles easily
- Light enough to carry in one hand
- Machine-washable removable cover
Cons
- Wide frame will not sit three across
- Cover removal needs near-full disassembly
- Cup holders are awkward to detach
We spent the most time on this seat because it is the one parents keep coming back to. The extension panel is the whole story: it extends the shell in four positions and adds up to 5 inches of leg room, which is exactly the amount a tall four-year-old needs to stop folding their knees.
The harness runs rear-facing from 4 lb to 50 lb and forward-facing from 26.5 lb to 65 lb. The No-Rethread Simply Safe Adjust system moves the headrest and harness together, so daily adjustments take one hand and there are no straps to thread back through the shell.
Graco engineered the shell to ProtectPlus standards for side and frontal impact, and owners consistently report a straightforward install in a mid-size SUV. Swapping it into a second vehicle is realistic, which matters if your family drives two cars.
The honest drawback is width. This is not a three-across seat, and in a small sedan it crowds the front passenger footwell more than a narrow convertible would. Deep-cleaning the cover is genuinely fiddly because you have to take the seat almost apart, and crumbs do find their way into the shell crevices.
What the extension panel actually solves
Bent knees are not a safety problem in a rear-facing seat. The problem is comfort, and comfort is what pushes parents to turn a child forward at three years old. The panel adds real space exactly where the child needs it, which is why this seat keeps showing up as the answer for long-legged toddlers.
Who should skip it
If you need three seats across the back bench, the Extend2Fit is the wrong shape for the job. It is also more work to deep clean than the safety seats with snap-off pads, so if a washable pad is your top priority, look at the Grow and Go instead.
2. Safety 1st Grow and Go All-in-One — Best Value All-Rounder
Safety 1st Grow and Go All-in-One Convertible Car Seat, Alaskan Blue
Rear-facing 5-40 lb
Forward harness 30-65 lb
Booster 40-100 lb
Seat belt or lower anchors
Washer-and-dryer-safe pad
Pros
- Three stages in one seat from 40 lb to 100 lb
- QuickFit harness adjusts fast
- Snap-off pad and dishwasher-safe cup holders
- Removable baby pillows for a snug infant fit
- Moves between vehicles easily
Cons
- Rear-facing stops at 40 lb
- Heavier cushioning runs warm in hot weather
- Baby inserts must come out as the child grows
This is the seat we recommend when a family wants one answer that covers infancy through booster without chasing several models. The three stages run rear-facing 5-40 lb, forward-facing with harness 30-65 lb, and belt-positioning booster 40-100 lb, which is close to a full decade of use in one shell.
Cleaning is the quiet winner here. The seat pad snaps off and goes straight into the washer and dryer, and both cup holders are dishwasher-safe. If your kid is a snacker, that saves you from the near-disassembly routine the Graco above requires.
The QuickFit harness adjusts quickly enough for daily use, and three recline positions give a decent rear-facing angle for a child who is still slumping in naps. Removable Grow-With-Me pillows help a smaller baby sit properly and then come out as they grow.
The 40 lb rear-facing ceiling is the compromise. It is a real limit and it will bring the rear-facing chapter to a close earlier than a 50 lb seat would. Reviewers also note the padding holds heat in warm weather, which can be unpleasant for a sleeping toddler.
When 40 lb is genuinely enough
Height, not weight, usually ends rear-facing first. Plenty of children top out around 40 lb with room to spare in the shell, so this seat can still deliver a rear-facing run past age four for average-sized kids. The parents who regret it are the ones with a child on the 95th percentile for height.
What you give up for the simpler setup
No extension panel means less leg room on a tall child, and the inserts have to be removed as your child grows or the harness fit suffers. If you know your child is going to pass 40 lb while still short enough to sit rear-facing, you are better served by one of the 50 lb seats.
3. Diono Radian 3R — Best Slim Seat That Still Rear-Faces to 50 lb
Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear Facing & Forward Facing, 10 Years 1 Car Seat, Slim Fit 3 Across, Gray Slate
Rear-facing up to 50 lb
5-120 lb across 4 modes
Slim three-across profile
Automotive-grade steel core shell
Folds flat, airline approved
Pros
- Slim profile genuinely fits three across in compact cars
- Rear-faces to 50 lb on a steel-reinforced frame
- Harness straps adjust without constant readjusting
- Folds flat and is airline approved
- One seat covers birth through booster
Cons
- Install and mode-switching are unusually complex
- Very heavy for a two-vehicle family
- Rear-facing recline is deep and pushes the front seat forward
- Center position only when the vehicle has a fixed headrest
The Diono solves the problem nobody else on this list solves well: a narrow body that still rear-faces to 50 lb. Its slim profile fits three across in compact vehicles, and the automotive-grade steel core shell is built to outlast the other convertibles we tested.
Four modes cover birth through booster on a 5-120 lb range, and the included ComfortPlus memory foam makes long rear-facing stretches bearable. The seat folds flat for storage and travel and carries airline approval, which is unusual in a convertible this size.
Where the Diono asks the most of you is installation. The SuperLatch system and the rules that change with facing direction and child weight are genuinely complex, and a certified Child Passenger Safety Technician is recommended before the first install. Budget an hour and read the mode rules twice.
It is also heavy. Parents with two vehicles describe it as a seat that stays in one car, and the deep rear-facing recline means the front passenger seat has to slide well forward. Reviewers confirm the straps themselves adjust smoothly and stay put between changes.
Why the slim profile matters more than it sounds
A 17-inch-class shell changes the geometry of your back row. It fits three across where a full-size convertible fits two, and the narrow body also takes less front-to-back depth, so a tall driver keeps more leg room behind them.
The trade-off you should know about
Steel does not make installation easy. If you are not comfortable with a complex first install, or you move the seat between cars every day, pick something lighter and simpler. This one rewards a family that installs once and leaves it in place.
4. Graco 4Ever DLX 4-in-1 — Best Multi-Stage Seat With the Widest Recline
Graco 4Ever DLX 4-in-1 Convertible Car Seat, Charlie
Rear-facing 4-40 lb
Forward harness 26.5-65 lb
Highback booster 40-100 lb
Backless booster 40-120 lb
6-position recline
Pros
- Four stages covering roughly 10 years of use
- 10-position headrest with one-motion no-rethread harness
- 6-position recline supports comfortable rear-facing
- ProtectPlus side and frontal impact engineering
Cons
- Rear-facing harness stops at 40 lb
- Bulky footprint for a full-size convertible
- Smaller review base than the Graco Extend2Fit
Four stages is the headline number here. The 4Ever DLX runs rear-facing 4-40 lb, forward-facing with harness 26.5-65 lb, highback booster 40-100 lb, and backless booster 40-120 lb, so it stays in the family for roughly a decade.
The six-position recline is the part that matters for rear-facing. Owners highlight how much adjustment range it gives, and the 10-position headrest moves together with the no-rethread harness so a growing child never needs the harness rethreaded through the shell.
Graco built it to ProtectPlus standards for side and frontal impact, which puts its crash credentials in line with the rest of the Graco lineup. The build quality and rating average sit right alongside the Extend2Fit, though with a much smaller set of customer reviews to draw from.
The limitation is the same 40 lb rear-facing ceiling that trips up the Grow and Go, plus a bulky footprint for a full-size convertible. Parents chasing the longest possible rear-facing run should look at the 50 lb seats further down this list.
Where the extra recline positions pay off
Extended rear-facing seats install at a shallower angle than infant carriers because the child is larger. More recline positions mean you can find a comfortable angle without wedging a towel under the base, which is the workaround many parents resort to with 3-position seats.
Who it suits best
A family that wants the absolute longest total product life and is comfortable that their child will leave rear-facing mode around 40 lb. The forward-facing harness and booster stages are where this seat earns its keep.
5. Graco Slimfit 3-in-1 — Best for Small Cars and Tight Benches
Graco Slimfit 3-in-1 Convertible Car Seat, Sydney
Rear-facing 5-40 lb
Forward harness 26.5-65 lb
Highback booster 40-100 lb
10% slimmer rotating cup holders
Protects to newest side-impact standards
Pros
- Narrow profile fits three across and small vehicles
- Anchors held tight rear-facing with almost no sliding
- Light enough to carry through an airport
- Cushioned yet slim with easy shoulder strap adjustment
- Covers come off easily for cleaning
Cons
- Runs hot due to heavy padding
- Not as plush as costlier seats
- Recline can be hard to set for a newborn
- One reviewer saw more movement with a belt install
The Slimfit is the practical pick when your car is the constraint. Rotating dual cup holders tuck away to make the seat 10% slimmer, and owners report it fitting three across and sliding into tight back benches that reject bulkier convertibles.
Rear-facing it runs 5-40 lb, forward-facing with harness 26.5-65 lb, and as a highback booster 40-100 lb. Graco engineered it to newest side-impact testing standards, and the no-rethread harness with 10-position headrest keeps daily adjustments simple.
Two things stand out in owner feedback. First, the lower anchors held tight rear-facing with virtually no sliding during travel, which is the single biggest predictor of a good install. Second, the seat is light enough to carry through an airport and its covers come off easily for cleaning.
The complaints are about comfort rather than safety. Heavy padding runs hot in warm weather, the rear side openings can blow air directly onto a child’s legs, and some parents found the recline hard to set far enough back for a newborn without help.
When slimness beats rear-facing capacity
If you need a seat behind a tall driver, or you want a usable third position in a sedan, physical fit comes before weight capacity. A 40 lb ceiling in a seat that actually fits is a better outcome than a 50 lb ceiling you cannot install properly.
Where comfort takes a hit
Plush padding is what makes a big child comfortable rear-facing, and that is exactly what the Slimfit trades away. In hot climates the heat build-up is the most common complaint, and it is worth weighing if your child sleeps in the car.
6. Britax One4Life — Best for the Longest Rear-Facing Run at 50 lb and 49 in
Britax One4Life All in One Car Seat, Up to 10 Years of Use — Teak
Rear-facing 5-50 lb and 18-49 in
Forward harness 30-65 lb
Highback booster 40-120 lb
ClickTight 3-step install
Side-impact tested to FMVSS 213a
Pros
- Rear-faces to 50 lb and 49 inches
- ClickTight install is a clear three-step process
- 15-position no-rethread harness and 9-position recline
- Steel frame with SafeCell and V-shaped tether
- Breathable SafeWash fabrics and washable cover
Cons
- Full-size footprint rules out three-across
- Premium tier versus Graco and Diono
- Booster mode is not covered by FMVSS 213a
- Limits vary by model so check the label
The One4Life publishes both numbers parents need: 50 lb and 49 inches rear-facing. It is also one of the few seats on this list with published rear-facing height limits, and that combination is what lets a large child stay backwards past the point where most families give up.
ClickTight installation is the part parents mention most. You pinch the seat open, thread and buckle, and click it closed, with colour-coded belt paths for each mode. The seat is verified by the Baby Safety Alliance and tested to FMVSS 213a side impact and FMVSS 213 frontal impact.
Adjustment hardware is unusually good. The 15-position no-rethread harness and 9-position quick-push recline both adjust with one hand, the recline has an easy-read indicator, and three infant inserts cover children at 20 lb and under.
The fabric deserves a mention for eco-conscious parents. SafeWash fabrics are naturally flame-retardant with no added chemicals, they are machine-washable, and the cup holders are dishwasher-safe. Steel frame, SafeCell, two layers of energy management, and a patented V-shaped tether round out the safety stack.
Why height limits are printed so rarely
Most manufacturers publish a weight range and stay quiet on height, which makes it easy to keep a child rear-facing past the point the shell can actually accommodate. Britax printing 49 inches removes that guesswork, and height is usually the binding limit before weight.
What the full-size footprint costs you
This is a large seat with a large price tag attached, and it will not fit three across in most configurations. Pick it when the rear-facing ceiling is the deciding factor and your back bench has room to spare.
7. Evenflo Revolve360 Extend — Best for Buckling a Big Child With One Hand
Evenflo Revolve360 Extend All-in-One Rotating Car Seat
Rear-facing up to 50 lb
360 degree rotation
Install once for both directions
LockStrong belt tensioning
Tether360 technology
Pros
- Rear-faces to 50 lb
- matching the highest capacity available
- 360 degree rotation allows one-hand loading
- Installed once for both facing directions
- LockStrong tensioning with a washable cover
Cons
- Bulky rotating base eats back seat space
- Rotation adds weight and cost
- Smaller review base than Graco and Diono options
A 50 lb rear-facing child is a big, squirmy load, and this is the one seat on the list that changes that. The 360-degree rotation swings the seat to a side-facing position so you can buckle your child in one-handed rather than wrestling straps over a squirming four-year-old.
The Sure360 Safety Installation System means you install it once and use it for both rear- and forward-facing modes, with LockStrong belt tensioning and Tether360 handling the secure fit. Extended rear-facing capacity runs to 50 lb.
L.I.F.E. GUARD side-impact protection sits under the shell, and the Quick Clean Cover removes and washes without a fight. For a family doing daily school-run pickups with a heavy rear-facing child, that combination of rotation and washable cover is the practical argument for this seat.
The base is bulky and takes a real bite out of back seat space, and rotating hardware adds both weight and cost compared with a fixed convertible. The review base is also the smallest of the mainstream options here, so you have less owner history to lean on.
When daily buckling is the hard part
Reaching over a rear-facing toddler to clip a chest clip is the daily friction most parents underestimate. Rotation removes it entirely, and for caregivers handling a heavy child alone, that daily saving compounds over months.
When the base is too much
If your back bench is small, the rotating base is a poor trade. The 50 lb rear-facing capacity is excellent, but you are paying in cabin space and weight for a convenience feature, and a fixed slim convertible gives you the same ceiling in a smaller footprint.
8. Britax Poplar S — Best Compact Seat With a 50 lb Rear-Facing Ceiling
Britax Poplar S Convertible Car Seat, Slim 17” Design — Cowmooflage
Rear-facing 5-50 lb and 18-49 in
Forward harness 30-65 lb
Slim 17 inch body
ClickTight install
ReboundReduce stability bar
Pros
- Rear-faces to 50 lb and 49 inches in a 17 inch body
- ClickTight install feels like the most secure latch owners have used
- Steel frame with SafeCell and V-shaped tether
- Small footprint frees front seat room in compact cars
- 14-position no-rethread harness and 6-position recline
Cons
- 2-in-1 only with no booster mode
- Very heavy for anyone lifting with difficulty
- ReboundReduce bar must be removed to go forward-facing
- Smallest review base at 170 ratings
- Britax cannot guarantee three-across in every vehicle
The Poplar S pairs a 50 lb and 49 inch rear-facing ceiling with a 17 inch slim body, which is the exact combination most roundups never manage. If you need extended rear-facing capacity and a three-across-capable footprint, this is the seat that does both.
It uses the same ClickTight installation as the One4Life in three steps with colour-coded belt paths, and owners describe the closed latch as the most secure they have experienced. The ReboundReduce carbon steel stability bar attaches for rear-facing use and comes off for forward-facing.
Safety credentials match the One4Life: a high-strength steel frame, SafeCell technology, a patented V-shaped tether, two layers of energy management, and testing to FMVSS 213a side impact and FMVSS 213 frontal impact, verified by the Baby Safety Alliance. SafeWash fabrics are naturally flame-retardant and machine-washable.
Two structural limits to weigh. It is a 2-in-1 with no booster mode, so it does not last as long as the all-in-one seats, and it is heavy, which is a genuine problem for anyone who struggles to lift heavy objects. Britax also cannot guarantee a three-across fit in every vehicle.
Check the 17 inch width against your own bench
A slim profile only helps if your back seat is actually tight. Measure the gap between door and adjacent seat, and check that the front seat can slide back far enough for the deeper rear-facing footprint.
Where the design ends
With no booster mode, you are buying a second seat in a few years, and the small review base means less long-term owner feedback than the rest of this list. The 50 lb rear-facing ceiling is the reason to consider it, not the product life.
When to Stop Extended Rear-Facing?
Stop extended rear-facing when your child hits either limit, whichever comes first. There is no age to aim for, and no law that requires a turn at a specific birthday.
Stop when your child reaches the seat’s published rear-facing weight limit. Four of the eight seats here stop at 40 lb, and four carry to 50 lb, which is roughly an extra year for an average child.
Stop when your child’s head sits within 1 inch of the top of the shell. This is the limit parents misread most often. When the head gets that close, there is no shell left above the shoulders to absorb a crash, and the correct response is a different seat, not a forward-facing turn.
Keep the harness until the forward-facing harness limit, not past it. Jumping to a booster while your child is still under 40 lb is a downgrade, not a graduation, and most roundups that drift into booster talk too early get this wrong.
State minimums are floors, not targets. Check your own state requirement, but a legal minimum rear-facing age is not a reason to turn a child at that age.
LATCH vs Seat Belt: What Changes at 40 Pounds
Lower anchors carry their own weight limit that is lower than the seat’s rear-facing limit, and this is the single most common source of confusion for extended rear-facing families.
Most vehicles cap lower anchors at 40 lb combined, sometimes 35 lb for a double buckle. The seat itself may rear-face to 50 lb with the vehicle belt, so a child between the anchor limit and the seat limit is not a sign that the seat failed. It means the install method changes.
When your child passes the lower-anchor weight limit, reinstall with the vehicle seat belt and use the belt lock-off, or a locking seat belt, so the belt cannot loosen. Re-check the one-inch movement test after every change, because a belt install behaves differently from an anchor install.
Parents on forums repeatedly report assuming their 50 lb seat was unusable past 40 lb. It is not. The seat is fine; the anchors are finished, and the belt does the rest of the work. If you are still comparing shorter-stage seats, our all-in-one car seat guide covers the same switch from another angle.
Key Features to Look For in an Extended Rear-Facing Seat
The rear-facing weight limit is the number that decides how long your child rides backwards, and 50 lb beats 40 lb every time. Height limit is the number most manufacturers skip, so look for the seat that prints both.
Leg room is the feature that keeps families from quitting early. An extension panel like the Graco Extend2Fit’s 4-position panel adds up to 5 inches, and bent knees are not a safety concern, but they are a comfort one that decides whether a child is still smiling about facing backwards at four.
Installation method decides how you will use the last 10 lb. Seat belt plus lock-off reach 50 lb, lower anchors usually stop at 40 lb, and anti-rebound bars or stability bars add rear-facing crash energy management while using up a little legroom behind the seat.
Vehicle fit is where extended rear-facing plans go wrong. Behind a tall driver, a deep rear-facing shell pushes the front seat forward, and a child who can already sit upright unsupported can tolerate a more upright install that frees that space. For a broader look at seat sizing, our general car seat testing roundup breaks down the categories.
Narrow shells earn their keep in small sedans and two-door hatches. A 17 inch profile from the Diono Radian 3R or the Britax Poplar S fits where a full-size convertible simply will not, and for parents moving from an infant carrier stage our infant car seat picks cover the first seat in the sequence.
How to Check Your Rear-Facing Install in Four Steps
Grip the seat at the belt path, not at the cup holders or headrest, and pull hard. Movement at the belt path should be less than 1 inch; movement at the top of the shell tells you nothing useful.
Set the recline so the harness stays level or slightly angled when your child is in it, and check the indicator line on the shell. If you are wedging a rolled towel to get there, the seat or the vehicle is wrong for the job.
Keep the top harness slots at or below the shoulders rear-facing. Slots above the shoulders in a rear-facing seat put the harness on the wrong side of the body for crash protection.
Place the chest clip at armpit level, then buckle and pull the harness snug until you cannot pinch a flat at the collarbone. Repeat the one-inch test after every harness height change and every switch to a new vehicle.
Frequently Asked Questions
What is the longest rear-facing car seat?
The longest rear-facing setups reach 50 lb and 49 inches. In this group that includes the Graco Extend2Fit 2-in-1, the Diono Radian 3R, the Britax One4Life, the Evenflo Revolve360 Extend, and the Britax Poplar S. For most children, 50 lb rear-facing means staying backwards until around age four or five rather than age two. The Graco Extend2Fit adds up to 5 inches of leg room through its extension panel, which is what makes that extra year comfortable.
Should my 3 year old still be rear facing?
Yes, in most cases. The American Academy of Pediatrics recommends rear-facing until a child reaches the maximum rear-facing weight or height limit of their seat, which for many children means age four or five. A three-year-old who is under 40 lb and whose head is still well below the top of the shell should stay rear-facing. Turning forward early removes the protection the seat shell gives the head and neck.
When to stop extended rear-facing?
Stop when either limit is reached. The first is the seat’s published rear-facing weight limit, typically 40 or 50 lb. The second is your child’s head sitting within 1 inch of the top of the shell, which usually happens first. When the head gets that close, a different seat is needed rather than a forward-facing turn. After turning, keep the harness until the forward-facing harness limit rather than moving straight to a booster.
What is the best long-term rear-facing car seat?
The best long-term rear-facing car seat is the one that combines the highest rear-facing weight limit with a rear-facing height limit and enough leg room to stay comfortable. The Graco Extend2Fit 2-in-1 leads here with a 4-50 lb rear-facing range and a 4-position extension panel that adds up to 5 inches. The Diono Radian 3R and Britax Poplar S reach 50 lb in slimmer bodies if your back bench is tight.
What age do kids outgrow a convertible car seat?
Most children outgrow the rear-facing stage of a convertible car seat between ages four and five, and the forward-facing harness stage a couple of years after that. The exact age depends on your child’s height and weight rather than the calendar. A shorter child may leave rear-facing mode near 40 lb, while a tall child can outgrow the shell’s height limit before reaching the weight limit at all.
What is the best car seat for a 5-year-old child?
At five, a child usually belongs in a forward-facing harness or a highback booster rather than a rear-facing seat, unless they are small enough to still meet the rear-facing height limit. For that stage, the Graco 4Ever DLX runs a forward-facing harness from 26.5 to 65 lb, and the Safety 1st Grow and Go covers 30 to 65 lb with a harness and 40 to 100 lb as a booster. A 5-year-old under 40 lb should stay in the harness, not a backless booster.
Conclusion
For most families the Graco Extend2Fit 2-in-1 is the best car seat for extended rear facing, with a 50 lb rear-facing ceiling and an extension panel that adds up to 5 inches of leg room. If your back bench is tight, the Diono Radian 3R gives you the same 50 lb limit in a slim three-across body, and if daily buckling is the struggle, the Evenflo Revolve360 Extend makes loading a large child a one-hand job.
Whatever you pick, measure your vehicle before you buy, check the printed height limit alongside the weight limit, and stay rear-facing until one of the two limits is reached rather than until a birthday.