Bike

Boulder B-Cycle is a nonprofit bike-sharing program that allows you to check out a bike at any B-Cycle station in Boulder and return it to another B-Cycle station. Take as many short trips as you like (usage fees apply to all rides over 30 minutes.)
boulder.bcycle.com

Bus

Local and regional bus transportation is available through RTD. Its website offers an excellent trip planner to help you get from campus to the airport, Denver or local Boulder areas.
rtd-denver.com

Car

The local nonprofit eGo CarShare provides a car-sharing service with more than 20 locations throughout Boulder, including 10 vehicles on or next to campus. Members can use any of the vehicles in Boulder, including a pickup truck, plus approximately 20 vehicles in Denver.
carshare.org