Road Biking Routes in Colorado

Colorado is one of the great road cycling states, with more high paved passes than anywhere else in the country and a deep racing culture to match. Road biking in Boulder is the heart of it. The city has a cycling culture few places in North America can match, and the canons that climb straight out of town, Flagstaff Mountain, Left Hand Canyon and Boulder Canyon, are proving grounds for professionals and weekend cyclists alike.

Beyond the Front Range, Colorado holds the highest paved roads on the continent. Mount Blue Sky, west of Denver, tops out at 14,264 feet and is billed as the highest paved road in North America. Trail Ridge Road crosses Rocky Mountain National Park at 12,183 feet, and Independence Pass carries you over the Continental Divide into Aspen. The Peak to Peak Highway runs the length of the Front Range foothills, and Pikes Peak climbs from Colorado Springs.

For quieter days, the state has excellent paved paths. The Boulder Creek Trail runs through the middle of Boulder, the Glenwood Canyon Trail follows the Colorado River between canyon walls, and the Vail Pass path climbs away from the interstate. Colorado also hosts some of the biggest events in American cycling, including the Triple Bypass over three passes in a single day.

The season depends almost entirely on elevation. The Front Range around Boulder and Denver stays open for most of the year thanks to a dry, sunny climate, while the high passes only melt out from late May into June and close again by October. Everything here sits high, so if you are arriving from sea level give yourself a few days before taking on a canyon climb. Most people bike Colorado independently, though guided and supported trips are available.

Colorado is a great state for cycling, but sometimes you want to just book a tour, show up, and ride your bike. Check out these road bike tours scattered all over the world so you can experience an epic bike tour for your next holiday.

You can also browse guided tours in the United States.

What’s New in 2026

• Mount Blue Sky, the highest paved road in North America, is open again. The road was shut for all of 2025 while crews repaired severe buckling and drainage problems, and it reopened for the 2026 season with the upper gates opening on 22 May. Reservations are required for the fee-access upper road and the summit area, and the booking system changed this year, so check the current rules even if you have been before. The peak was renamed from Mount Evans, and Denver Parks and Recreation now runs the welcome centre.
• Trail Ridge Road opened for the season on 29 May 2026 and climbs to 12,183 feet across Rocky Mountain National Park. The park runs a timed-entry reservation system from 22 May to mid-October 2026, and Trail Ridge sits inside the standard reservation window between 9 am and 2 pm. The system is built around vehicles, so confirm the park’s current guidance before planning a bike day up there. Expect ice and cold at the top well into June.
• Season is set by elevation. The Front Range around Boulder is dry and sunny enough to bike nearly year-round, and the canyons are good from spring through autumn. The high passes, including Blue Sky, Trail Ridge and Independence, only clear from late May into June and shut again by October, so a summer trip is the only way to link them.
• Altitude is the thing visitors underestimate. Boulder sits at roughly 1,655 m before you climb anything, the Peak to Peak Highway runs along the Continental Divide, and Blue Sky finishes above 4,300 m. Arrive a few days early, drink more than you think you need, and treat your first climb as a test.

The Best Road Bike Routes in Colorado

Canyon and mountain climbs

• Flagstaff Mountain: a steep, twisting climb from the base of the Flatirons, minutes from downtown Boulder and one of the steepest roads in the area.
• Left Hand Canyon: a long, steady climb along a shaded shoulder, and one of the best days out on the Front Range.
• Boulder Canyon: the most scenic canyon in the area, though narrow shoulders and steady traffic make it one for confident cyclists only.
• Peak to Peak Highway: a high, scenic road running alongside the Continental Divide, with several variations to suit the day you want.
• Jamestown: takes in the best of Left Hand Canyon and carries on to a small historic town tucked into the mountains.
• Lee Hill: a step up from Olde Stage, climbing higher and for longer, and a more committing day overall.
• Olde Stage Rd: the classic introduction to climbing in Boulder, a short, straightforward ascent with a fun descent off the back.

Flatter routes and paths

• N 63rd St: the classic Boulder loop, gently rolling with mountain views and a generous shoulder throughout.
• US 36 to Lyons: a popular route north of town and a long-standing training ground for professional athletes.
• Boulder Creek Trail: the most scenic and continuous of Boulder’s car-free paths, running right through the middle of town.

Plan Your Trip

Colorado is one of the best states for road biking in the USA, part of our wider road biking routes collection. For dirt, browse mountain biking in Colorado, or head out on foot with our hiking routes in Colorado.

Frequently Asked Questions About Road Biking in Colorado

Where is the best road biking in Colorado?

Boulder is the epicentre, with Flagstaff Mountain, Left Hand Canyon and Boulder Canyon climbing straight out of town and the Peak to Peak Highway running along the Continental Divide. Beyond the Front Range, Colorado holds the highest paved roads on the continent, including Mount Blue Sky at 14,264 feet, Trail Ridge Road across Rocky Mountain National Park and Independence Pass into Aspen.

When is road biking season in Colorado?

It depends on elevation. The Front Range around Boulder and Denver is dry and sunny enough to bike for most of the year, and the canyons are at their best from spring through autumn. The high passes, including Mount Blue Sky, Trail Ridge Road and Independence Pass, only clear from late May into June and close again by October.

Can you cycle up Mount Blue Sky?

The road reopened for the 2026 season on 22 May after being closed through 2025 for repairs, and at 14,264 feet it is billed as the highest paved road in North America. Reservations are required for the upper road and the booking system changed in 2026, so check the current rules before you set out. The peak was formerly named Mount Evans.