BSGBoosterSeatGuide

State law page

Montana Booster Seat Laws & Requirements (2026)

Child restraint required | Under 2 years must ride rear-facing | 2-4 yrs rear-facing or forward-facing in a harnessed seat | 5-8 yrs in a harnessed seat or booster | 9 years and older in a booster seat until outgrown, then seat belt

Start with requirements Try the seat finder
FieldMontana snapshot
Age requirementChild restraint required | Under 2 years must ride rear-facing | 2-4 yrs rear-facing or forward-facing in a harnessed seat | 5-8 yrs in a harnessed seat or booster | 9 years and older in a booster seat until outgrown, then seat belt
Height requirementSee child-restraint rule; includes height language where listed.
Weight requirementNo weight threshold listed in GHSA summary.
Fine / penaltyVerify fine with state source; GHSA notes first-offense fines vary by state.
Last checkedGHSA reviewed by SHSOs June 2025; extracted 2026-07-23
Verification levelIndex source; official state verification pending
Child restraint requiredChild restraint required | Under 2 years must ride rear-facing | 2-4 yrs rear-facing or forward-facing in a harnessed seat | 5-8 yrs in a harnessed seat or booster | 9 years and older in a booster seat until outgrown, then seat belt
Adult safety belt permissible9 yrs and older after outgrowing booster seat
Verification levelIndex source; official state verification pending

Sources

Law and source links

Index source: https://www.ghsa.org/state-laws-issues/child-passengers

Statute/source text: GHSA child passenger law summary; Safe Kids state law tracker cross-check

Safety guidance

Even when Montana law allows a seat belt, NHTSA, CDC, and AAP guidance may still recommend a booster until the vehicle belt fits properly.

Requirements guide

Understand age, height, weight, and seat belt fit.

Read requirements

Age guide

See when children typically start and stop using boosters.

Read age guide