 The League of American Bicyclists has rated Colorado as the sixth most bicycle @-@ friendly state in the nation for the year 2014 . This is due in large part to Front Range cities like Boulder , Fort Collins and Denver placing an emphasis on legislation , programs and infrastructure developments that promote cycling as a mode of transportation . Walk score has rated Denver as the third most bicycle @-@ friendly large city in the United States . Many Denver streets have bicycle lanes , and there are over 850 miles of paved , off @-@ road , bike paths in Denver parks and along bodies of water , like Cherry Creek and the South Platte . This allows for a significant portion of Denver 's population to be bicycle commuters and has led to Denver being known as a bicycle friendly city . According to data from the 2011 American Community Survey , Denver ranks 6th among US cities with populations over 400 @,@ 000 in terms of the percentage of workers who commute by bicycle at 2 @.@ 2 % of commuters . In addition to the many bike paths , Denver launched B @-@ Cycle – a city @-@ wide bicycle sharing program – in late April 2010 . The B @-@ Cycle network was the largest in the United States at the time of its launch , boasting 400 bicycles . Through the acquisition of new grants , the program has continued to expand each year , adding dozens of new stations , hundreds of bikes , and by beginning service during the winter months . 
