An overview of Colorado's bicycle laws, reviewed and cited to primary sources. Use the sections below to jump to a specific rule, or the Sources block at the end for the full citation list.
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.
Helmet rules
Required under age
No statewide age requirement
Applies to passengers
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Standard
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Penalty
Colorado has no statewide bicycle-helmet law. No Colorado municipality currently mandates helmets for adult cyclists; some county-run skate parks and youth cycling programs require CPSC-certified helmets as a condition of entry.
C.R.S. § 42-4-1412(10) lets bicyclists ride on sidewalks and pathways unless prohibited by local ordinance or official sign. Riders must yield the right-of-way to pedestrians and give an audible signal before overtaking. Denver, Boulder and Colorado Springs ban sidewalk riding in their central business districts under local ordinances; check the municipal code where you ride.
Colorado's DUI and DWAI statutes (C.R.S. § 42-4-1301) apply only to operators of a 'motor vehicle,' and § 42-1-102(58) excludes bicycles from the definition. Electrical assisted bicycles are likewise excluded under § 42-1-102(28.5). Cyclists riding under the influence may still be cited for careless driving (§ 42-4-1402) or charged with public intoxication, but the DUI consequences — including a nine-month licence revocation — do not attach to bicycle operation.
White lamp on the front, visible from a distance of at least 500 feet.
Rear requirement
Rear reflector or light
Rear spec
Red reflector on the rear visible from a distance of 600 feet when directly in front of lawful upper-beam headlamps. A red rear lamp visible from 500 feet may be used in addition to the reflector.
Two abreast permitted; persons riding two abreast shall not impede the normal and reasonable movement of traffic and shall ride within a single lane. C.R.S. § 42-4-1412(6).
CDOT permits bicycle travel on the paved shoulders of rural Interstate segments where no reasonable alternative exists, including most of I-70 west of Denver and large portions of I-25 and I-76. Urban Interstate segments through metro Denver, Colorado Springs, and Fort Collins are signed prohibited, as are the Eisenhower–Johnson tunnels on I-70 (a designated cyclist shuttle is provided).