Bicycle Helmet Laws in Massachusetts
Last reviewed by BikeSize EditorialThis 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.
The rule
Massachusetts requires a bicycle helmet for any rider under the age of 17. The same rule extends to children carried as passengers in a child seat or trailer. Non-criminal violation; no fine in practice for first offense. The statute applies to anyone aged 16 or younger and to passengers carried in a child seat or trailer (passengers must be at least one year old). See Mass. Gen. Laws ch. 85, § 11B½. Read the national helmet laws guide for comparison. Confirm equipment fit with the helmet size calculator before relying on an age rule alone.
Statute
What this means in practice
If you're 17 or older, Massachusetts doesn't require you to wear a helmet by state law. Riders under 17 (and any child carried as a passenger) must wear a helmet that meets the ANSI Z90.4, Snell, or ASTM F1447 (CPSC-certified helmets meet these specifications) 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.
Get the fit right
Find your CPSC-certified helmet size
A helmet that meets the law but does not fit will not protect you. Measure your head circumference, then shop a size band you can trust.
Open the helmet size calculator