This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
Alabama requires a bicycle helmet for any rider under the age of 16. The same rule extends to children carried as passengers in a child seat or trailer. Civil violation. Warning on a first offense; subsequent violations carry a fine of up to $50, but the court must waive the fine on proof that the rider has obtained a conforming helmet. See Ala. Code § 32-5A-282 (Bicycle helmets required for persons under 16).
If you're 16 or older, Alabama doesn't require you to wear a helmet by state law. Riders under 16 (and any child carried as a passenger) must wear a helmet that meets the ANSI Z90.4, Snell B-90 or ASTM F1447 (the statute predates the federal CPSC standard but a CPSC-certified helmet satisfies all three). standard.
Cities can be stricter than the state floor, and bike-share systems often require helmets regardless of age. If you're renting or commuting in a major city, confirm the local rule before you ride.