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Image: Graco, from gracobaby.com. Colors may differ from the seat you buy. See it on gracobaby.com
An all-in-one car seat with 3 modes: rear-facing harness 5 to 40 lb; forward-facing harness 26.5 to 65 lb, up to 49 in; high-back booster 40 to 100 lb, 43 to 57 in.
$199.99on gracobaby.com, as of 2026-10-07 05:47 UTC. Prices change.
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The Graco TrioGrow SnugLock 3-in-1 is an all-in-one seat used rear-facing from 5 to 40 lb, forward-facing with the harness from 26.5 to 65 lb up to 49 in, and as a highback booster from 40 to 100 lb and 43 to 57 in from age 4. It installs with a SnugLock lock-off and expires after 10 years.
It suits a parent who expects to install with the vehicle belt and wants a lock-off to hold it; the manual says that with SnugLock you do not need to switch the retractor. Graco lists it at 19 in wide, 20 in deep and 18.92 lb. The TriRide has the same limits, dimensions and 6 recline positions without SnugLock, so the lock-off is the main reason to choose this one.
A research summary of Graco’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
This seat covers 3 stages, and a child has to meet every limit of the stage they are in. Graco gives it a 10-year life from the date of manufacture, so check the date label before using a hand-me-down.
| Mode | Child weight | Child height | Minimum age | Conditions |
|---|---|---|---|---|
| Rear-facing harness | 5 to 40 lb | Not published | Not published | Head must be at least 1 in below the headrest adjustment handle |
| Forward-facing harness | 26.5 to 65 lb | Up to 49 in | Not published | — |
| High-back booster | 40 to 100 lb | 43 to 57 in | 4 years | At least 4 years old |
A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
At 19 in at its widest, measure your back seat before counting on three across. It weighs 18.92 lb, which matters if you will move it between cars or carry it through an airport.
Aria, Warren.
To reach the lock-off, loosen the harness, raise the headrest to the top, unbuckle, undo 2 snaps and pull the bottom seat pad back. Push the lever to open SnugLock and rotate it to the rear-facing or forward-facing belt path as needed. Route the vehicle belt, or the lower anchor strap, under the lock-off, press down in the center of the seat and remove slack, then close SnugLock until it clicks. The manual warns not to pull the belt with excessive force and to keep hands away from the locking area. The seat should move less than 1 in at the belt path.
Rear-facing, choose one of the three rear-facing recline positions and keep the head at least 1 in below the headrest adjustment handle. Forward-facing, use recline position 4, 5 or 6, and position 5 for children over 40 lb. Lower anchors are not for a child over 45 lb. The infant head and body supports are only for children under 20 lb. In highback booster mode the harness goes into its storage compartment and the seat sits in recline position 6. LATCH can hold the booster in place up to 100 lb, while the lap and shoulder belt holds the child.
Graco says to machine wash the seat pad in cold water with gentle soap on a delicate cycle and drip dry, without bleach. The harness and LATCH strap are surface wash only with mild soap and a damp cloth or wipes; do not immerse them. Clean the buckle by agitating it in a cup of warm water and pressing the red button, without soap, detergent or lubricant, and do not submerge the buckle strap. Stop using the seat and throw it away 10 years after the date of manufacture.
Source: Graco TrioGrow SnugLock 3-in-1 Car Seat product page
No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.
Rear-facing is 5 to 40 lb with the head at least 1 in below the handle, forward-facing is 26.5 to 65 lb up to 49 in, and the highback booster is 40 to 100 lb and 43 to 57 in for children at least 4.
Graco TrioGrow SnugLock 3-in-1 Car Seat product page (opens in a new tab)
No. The manual says that when using the SnugLock lock-off you do not need to switch the retractor, because the lock-off locks the seat belt.
Graco TrioGrow SnugLock 3-in-1 manual (PDF) (opens in a new tab)
It is certified for aircraft with the harness, on forward-facing aircraft seats, and only when the SnugLock lock-off is not used. It is not certified as a booster because aircraft have no shoulder belts.
Graco TrioGrow SnugLock 3-in-1 manual (PDF) (opens in a new tab)
Graco lists it at 19.00 in wide, 20.00 in deep and 23.25 in tall, with a product weight of 18.92 lb.
Graco TrioGrow SnugLock 3-in-1 Car Seat product page (opens in a new tab)
The TriRide has the same mode limits, 6 recline positions and 10 headrest positions, and Graco lists it at 19 in wide and 18.45 lb. Graco lists it as LATCH equipped and does not list SnugLock for it.
Graco TriRide 3-in-1 Car Seat product page (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| TrioGrow SnugLock 3-in-1 Car Seat (this seat) | 100 lb | 18.92 lb | 19 in | 10 years |
| Extend2Fit Convertible Car Seat | 65 lb | 19 lb | 19.5 in | 10 years |
| Contender Slim Convertible Car Seat | 65 lb | 16 lb | 18.9 in | 7 years |
| Extend2Fit 3-in-1 Car Seat | 100 lb | 20.61 lb | 19 in | 10 years |
| Extend2Fit 3-in-1 Car Seat featuring Anti-Rebound Bar | 100 lb | 21.9 lb | 19 in | 10 years |
| 4Ever DLX 4-in-1 Car Seat | 120 lb | 23 lb | 21.5 in | 10 years |
| 4Ever DLX Slim 4-in-1 Car Seat | 120 lb | 27.5 lb | 18.9 in | 10 years |
| 4Ever DLX Grad 5-in-1 Slim Car Seat | 120 lb | 24.1 lb | 18 in | 10 years |
| 4Ever 4-in-1 Convertible Car Seat featuring TrueShield Technology | 120 lb | 24 lb | 21.5 in | 10 years |
| 4Ever Extend2Fit 4-in-1 Car Seat | 120 lb | 25.99 lb | 21.5 in | 10 years |
| Grows4Me 4-in-1 Car Seat | 110 lb | 22.5 lb | 21.5 in | 10 years |
| SlimFit3 LX 3-in-1 Car Seat | 100 lb | 19.2 lb | 16.7 in | 10 years |
| SlimFit 3-in-1 Car Seat | 100 lb | 19.47 lb | 19.9 in | 10 years |
| SlimFit LX 3-in-1 Car Seat | 100 lb | 21.5 lb | 19.9 in | 10 years |
| TriRide 3-in-1 Car Seat | 100 lb | 18.45 lb | 19 in | 10 years |
Other all-in-one seats whose published weight and height limits overlap the TrioGrow SnugLock 3-in-1 Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Not published |
| Forward-facing harness | 22–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Not published |
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
$319.99Maddox 2.0 · Amazon price as of 2026-11-01 12:10 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Not published |
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
| Seat belt trainerfrom 5 years | 50–120 lb | 43–60 in |
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Not published |
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
$369.99Thompson · Amazon price as of 2026-11-01 12:10 UTC, subject to change
