Mark your Calendars for Bike to Work Day 2015. This year, Bike to Work Day will be Wednesday, June 24. Make sure to register as a part of the University of Colorado Boulder business challenge team and you'll be entered into a drawing to win great prizes. http://biketoworkday.us/join/2212/university-colorado-boulder Bike to Work Day is celebrated in many communities along the Front Range and in the mountains, but our region's event is the largest in the state.