Requirements guide
Understand age, height, weight, and seat belt fit.
Read requirementsState law page
Idaho Booster Seat Laws & Requirements (2026)
Under 7 years
| Field | Idaho snapshot |
|---|---|
| Age requirement | Under 7 years |
| Height requirement | No height threshold listed in GHSA summary. |
| Weight requirement | No weight threshold listed in GHSA summary. |
| Fine / penalty | Verify fine with state source; GHSA notes first-offense fines vary by state. |
| Last checked | GHSA reviewed by SHSOs June 2025; extracted 2026-07-23 |
| Verification level | Index source; official state verification pending |
| Child restraint required | Under 7 years |
| Adult safety belt permissible | 7 years and older |
| Verification level | Index 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 Idaho law allows a seat belt, NHTSA, CDC, and AAP guidance may still recommend a booster until the vehicle belt fits properly.
Age guide
See when children typically start and stop using boosters.
Read age guideForward-facing guide
Know when to move from harnessed seat to booster.
Read transition guide