Iron Horse Classic — Three days of bicycling events in Durango, featuring a 50-mile bike tour, road race, criterium, and mountain bike race. The bike ride to Silverton caps at 2,500 cyclists; register early. Dates: May 28-30, 2016.
Colorado San Juan Skyway — Bicyclists travel for 235 miles from inn-to-inn during the week at above 5,000 feet elevation. Starts and ends in Durango. Presented by Adventure Cycling Association. Dates: June 5-11, 2016.
The Denver Post 2016 Ride the Rockies — The challenging ride celebrates its 31st anniversary in 2016. Route announcement is scheduled for Feb. 6, 2016 (see website for registration details; lottery registration). Dates: June 11-18, 2016.
The 2016 Bicycle Tour of Colorado — Now in its 22nd year, this ride covers 400-some miles of Colorado terrain. Check website for route. Limited to 1,500 cyclists. Dates: June 19-25, 2016.
Colorado Rocky Mountain Bike Tour — For the 10th anniversary bike tour, the loop begins and ends in Idaho Spring, with overnights in Breckenridge, Edwards, Granby, Estes Park and Evergreen. The 438-mile route summits eight mountain passes, including Trail Ridge Road in Rocky Mountain National Park. (Registration caps at 500.) Dates: July 31 – Aug. 6, 2016.
Pedal the Plains — A three-day loop bike ride that explores the flatness of eastern Colorado. Fifty to 70 miles per day, with a century option. Sponsored by the Denver Post, but certainly not to be confused with Ride the Rockies. with a century option one day. Dates: Sept. 16-18, 2016.
Also check out Bike the Byways — 25 scenic bicycle routes in Colorado for independent-minded bicyclists.