Most of the large- and medium-sized cities in Colorado have some form of public transit that can accommodate bicycles. Between riding and taking a bus or train, you can get around fairly easily without a car (if you’re willing to make the effort!).
FLYING WITH YOUR BIKE
Check out BikeState38’s guide to packing and flying with or shipping your bicycle.
REGIONAL
Bustang is a regional, North-South route between Colorado Springs, Denver and Ft. Collins, with separate service West to Frisco, Vail, Eagle and Glenwood Springs.
DENVER-BOULDER-GOLDEN-EVERGREEN
RTD Bike-n-Ride information (airport train, commuter rail, light rail and bus service)
COLORADO SPRINGS
Mountain Metro public transit (bus service)
SUMMIT COUNTY
Summit Stage (FREE bus service)
DURANGO
Public transit (bus service and trolley routes)