Iowa Booster Seat Laws 2025. Iowa law doesn’t specifically mention booster car seats or the age until you should use the booster car seat. All iowa children who are under 18 years old must be properly secured in an appropriate child restraint system or seat belt.
Children who are more than 4 years old but less than 8 years old, weigh more than 20 lbs but less than 65 lbs, and are less than 57 inches tall must ride in a properly secured. All iowa children who are under 18 years old must be properly secured in an appropriate child restraint system or seat belt.