Updated 2019. The Monterey as described in this article has been discontinued, which makes us super sad because we loved it so very much.
Diono does make a seat called the Monterey XT, but it’s not quite the same as this one, although certain elements are similar.
It’s b-a-a-a-c-k! Back and better than ever is the Diono Monterey booster, seen here in review (and scroll down, as a giveaway!). It had disappeared from the market for about a year and we were very sad…and then thrilled to learn it was making a comeback! The Monterey is a favourite of techs, and for very good reason. It is one of the tallest boosters on the market, kids find it very comfortable, and it generally provides excellent belt fit in a variety of vehicles.
The Monterey retailed for $160 and was widely available.
It is currently available in three fashions: Bloom (pink), Surf (blue), and Heather (grey, reviewed here).
What we love
- Fits children 40-120 pounds and 38-63”, making it one of the longest-lasting and tallest boosters available
- Provides excellent belt fit on most kids in most vehicles
- The adjustable seat back width means it can be adjusted for different-sized kids, helping smaller children stay contained and in position, while still being comfortable for larger kids who would still benefit from the back portion
- Long seat pan provides lots of support for long-legged kids
- Has UAS so it’s not a projectile when not in use (optional)
- Variable recline positions for comfort and to fit various vehicle seat shapes
- Stowable cup holders can be tucked away when not in use or if you need more room (what treasures would your kids keep in theirs?)
Fit to child:
The Monterey in high-back mode provided excellent belt fit on every child we tried. As always though, we do recommend always trying a seat before purchase if possible. The children we tested said they love how cushy and comfortable it is and the retractable cup holders. One 7 year old said she liked it even though it wasn’t pink – gasp!
At 21″, the backrest adjusts to one of the tallest heights on the market, meaning it is a great choice for tall and long-torsoed kids who could still use the support of the back.
When evaluating belt fit of a booster seat to a child, you want to ensure the lap belt is low and flat on their thighs (not up high on the belly) and that the shoulder belt is centered in the middle of their collar bone.
On the smaller end of the spectrum, the child below is five and is just 40 pounds and 43”. Her regular seat is still a harnessed seat. The lap belt fit was excellent and she declared the seat to be very comfortable. I appreciated the ability to adjust the side walls narrower.
Another smaller child, at five, 42 pounds and 42” tall. Again, the belt fit is excellent and the seat pan gives lots of support to her legs.
These two kids have very similar stats, at 50” tall and 51 and 55 pounds respectively. Again, excellent belt fit and they found it very comfortable.
At 9 ½, 62 pounds, and 56″ tall, this child normally rides in a backless booster (and is clearly super thrilled to be testing this out in highback mode!), but she is within the specs and still just fits. This would be very useful for a young but tall child who would still benefit from the support of the high-back, or for a child who still falls asleep in the car to give them somewhere to rest their head so they don’t slump out of position.
Road tripping with her family this 8 year old is 90lbs and 4’8″ (54″) tall and prefers to have the back on the 2012 version of the Monterey (virtually unchanged except for the style of the upper belt guide so we included this photo for comparison).
Using the Monterey as a backless booster may or may not work for your child/vehicle combination. When buying a seat now for a 5-6+ year old it is hard to predict their build, or know for sure what you will drive, when they have outgrown the back and need to use it backless. Pictured here without the back we don’t like the belt fit on the lap belt; it’s too low on the legs and isn’t making contact with the hip bones — because without the back portion on the child has scooted back away from the belt. If you do find that is the case consider a backless booster such as Diono’s Solana, or another option well-suited to your child.
The Monterey also worked exceptionally well in most seating positions and vehicles that we tried. It does have UAS hooks to latch the booster into the vehicle with an up-front adjustment mechanism to tighten and loosen each connector. This does not provide any extra safety to the booster rider, but does mean that the booster seat isn’t a projectile when not in use, and is a convenience feature that we find, well, convenient! Use of UAS is an optional feature, and if you don’t have UAS in the position you use the booster in we always recommend buckling the booster in when not in use.
Sometimes with high-back boosters the shoulder belt won’t always retract properly through the belt guide. This is not ideal as the belt won’t be in a good position to keep a child restrained properly if, for instance, the child has leaned forward (hopefully while the car is not in motion!) or if you have had to brake suddenly. Compared to previous versions of the Diono and Sunshine Kids Monterey this revamped Diono Monterey has a redesigned belt guide that tends to be very friendly with most shoulder belts. We found it worked very well in most of the vehicles/seating positions that we tried, including one position where the belt comes at an awkward angle that generally doesn’t work with high back boosters. We did find one seating position in one vehicle where the belt didn’t retract, but in general the Monterey would be an excellent bet.
Diono wants the Monterey seat back to make contact with the vehicle seat and to minimize gaps; if there is a gap, they have advised to contact them for evaluation. Some larger or fixed and forward-leaning head restraints may create too large of a gap to be safely used with the Monterey but as vehicle geometry varies so widely it’s best to leave the decision making to the manufacturer. Take a clear photo or two from more than one angle and let them evaluate the fit for you.
The Monterey does require vehicle head support behind it, even in high-back mode, so it is not an option for vehicles with no head restraints. Diono does not allow the vehicle’s buckle to cross the lower belt guide, so it also may not be an appropriate choice if your vehicle has very long buckle stalks.
The Monterey is an excellent booster seat that is loved by technicians, parents and kids alike. It provides excellent belt fit on a large range of children, is one of the tallest high-back boosters on the market with one of the highest weight ranges, and has features to make it a comfortable and convenient seat to use.
It is not the seat for you if you need a booster in a position with no head restraint or if your vehicle has exceptionally long buckle stalks. It may not work if you have fixed, forward-leaning head restraints. As always, if possible try before you buy to ensure it fits your child in your vehicle.
Thank you to Diono for providing the seat shown in this review. All opinions are our own.
Thank you to Diono for providing one booster seat in “Heather” fashion to one lucky reader – this giveaway is closed! Please remember that booster seats aren’t an appropriate option for a child until s/he is consistently over 40lbs, and has the maturity to sit properly in position at all times, usually beginning around age 5-6+. Do you have such a creature?