Need help? Advice?

(866) 600-BEAN (2326)

10-6 EST, m-f

You are here:
Popup view is
Newborn - 8 yrs

Diono Diono Rainier Convertible Car Seat + Booster 2018 (with new updated weight limit)

About the Diono Rainier Convertible Car Seat + Booster 2018 (with new updated weight limit)

Please note: This is a new and improved 2018 Diono Rainier Convertible Car Seat that is NOT affected by the voluntary recall. It features an updated forward-facing with 5-point harness weight limit of 20-65 pounds.


The Diono Rainier Convertible Car Seat/Booster Seat 2018 hails from Diono headquarters in Seattle, so it’s natural that they named a seat that hits new heights in safety and comfort for their famous mountain! The Rainier Car Seat boasts extra-deep side walls for superior Side Impact Protection (SIP), and has the highest forward-facing capacity of any car seat with a five-point harness, protecting kids weighing up to 90 pounds. The Diono Rainier Car Seat / Booster Seat is made to fit your child right from day one up to the end of her booster years, with the following weight/height requirements:


  • Rear-facing car seat: Use from 5-50 pounds, suitable for use from birth with included infant body support cushions;
  • Forward-facing with five-point harness: Use from 20-65 pounds;
  • Belt-positioning booster: Use from 50-120 pounds, or up to 57” in height.


As with all Diono child safety seats, the Diono Rainier Convertible Car Seat / Booster is loaded with technologically advanced, crash-tested features that provide superior protection for your child, including:

  • A full steel frame and aluminum-reinforced sides;
  • An aluminum-reinforced headrest lined with EPS foam, with 12 height positions for optimal comfort and safety;
  • EPS foam surrounding your child’s head and body, for complete Side Impact Protection;
  • A Safestop energy-absorbing harness with 5 shoulder positions and 3 buckle positions
  • Rear-facing tether capability;
  • SuperLATCH connectors with Secureweave webbing, providing the strongest and easiest connection between your car seat & car
  • A low vehicle seat position to add additional safety performance in the event of a crash.


The Diono Rainier 2018 car seat folds for travel, so you can take it along on planes – it’s FAA certified for use on aircraft, providing the same superb protection in the air as it does on the ground.


Comfort features on the Diono Rainier include:

  • Memory foam and infant body support cushions to cradle your baby’s body and position her correctly;
  • An extra-long leg support to keep kids in a comfy position even on long trips;
  • Additional harness pads for kids over 65 pounds;
  • A low position on your vehicle seat so it’s easy for kids to board;
  • An angled cup holder to keep drinks upright and easy to reach.


The cover on the Diono Rainier Convertible Car Seat / Booster Seat can be removed, and you can machine-wash and machine-dry it, so it’s easy to clean up the typical kid spills. It also has rubber bottom grips so it won’t slide around on the seat during installation, and multiple recline positions to fit your vehicle seat properly.


Other features include:

  • Designed with Safety Synergy™ technology for the highest level of performance & safety
  • Industry-leading 12 year product life
  • Space saving design allows extra room for passengers while providing spacious interior for child
  • Reinforced deeper sidewalls lined with energy-absorbing foam give Rainier superior head and body protection
  • 12 height adjustable head support, reinforced with aluminum and lined with energy-absorbing foam for complete side impact protection
  • Rear-facing tether capability
  • Anti-slip rubber seat grips

Diono Rainier Convertible Car Seat + Booster 2018 (with new updated weight limit) Specs

Max Weight Capacity:
50 lbs rear-facing | 65 lbs forward-facing
Min. Weight Required:
5 lbs rear-facing | 20 lbs rear-facing
Other Weight Capacity Info:
Booster from 50-120 lbs
Max Height Capacity (in.):
Additional Side Impact Protection:
5-Point Harness:
Open: 28.5" H x 18" W x 16" D | Folded: 28.5" H x 18" W x 10" D
Weight (when empty):
29.79 lbs

This product has no reviews...yet.


Help your fellow shoppers and

be the first to write a review!

Videos for Diono Rainier Convertible Car Seat + Booster 2018 (with new updated weight limit)

Diono Convertible Car Seats 2018 | Radian RXT, Radian R100, Rainier

In this video, Eli gives you FIVE REASONS to consider a Diono Convertible Car Seat! These steel-framed seats are incredibly safe, but choosing one can get confusing. Eli breaks down the differences between the Diono Radian RXT, Radian R100, and Rainier 2018 seats.


Order your Diono Radian RXT Convertible Car Seat + Booster 2018 with FREE shipping:


Order your Diono Rainier Convertible Car Seat + Booster 2018 with FREE shipping:


Order your Diono Radian R100 Convertible Car Seat + Booster 2018 with FREE shipping:


Comparing safety features is what we do best. If you're on the hunt for a Convertible Car Seat (or infant car seat, or stroller...) give us a call at 617-383-8259 or email us at Gear Gurus who love to geek out are standing by.



Artist: Nazar Rybak

Title: Light and Cheerful

Powered by:
by A Far Site Better
U.S. Patent 7,774,712
Shop Our Site
Shop a department below: