Washington Car Booster Seat Laws 2025: Safety Steps Every Parent Should Follow

In Washington, keeping children properly secured in vehicles isn’t just a legal requirement—it’s a life-saving habit. With car seat laws evolving in 2025, understanding the latest booster seat requirements ensures compliance and, more importantly, protects young passengers. This guide explains Washington’s current booster seat rules, age and height guidelines, and expert-backed tips to keep kids safe on every trip.

Why Booster Seats Matter in Washington

Booster seats are critical for children who outgrow forward-facing car seats but aren’t yet tall enough for standard seat belts. Unlike adults, children lack the neck and spine strength to tolerate direct seat belt pressure, which can cause serious injury in crashes. Washington state enforces strict rules to reduce preventable injuries—making booster seat use mandatory from age 5 to 8 or until reaching 4’9