The best traffic-free bike rides in Boulder County
4.7
(146)
10,989
riders
44
rides
No traffic road cycling routes in Boulder County are set against the backdrop of the Rocky Mountains, offering a diverse landscape for cyclists. The region features a mix of challenging climbs through canyons like Sunshine and Fourmile, alongside scenic routes through open spaces. Geological formations such as the Flatirons provide striking visual landmarks throughout many routes. This varied terrain ensures a range of experiences for road cyclists of all abilities.
Best no traffic road cycling routes in Boulder County
- The…
Last updated: April 24, 2026
280
riders
36.9km
03:19
1,020m
1,020m
Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride.
210
riders
21.0km
02:20
510m
510m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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5.0
(1)
83
riders
35.6km
02:22
1,120m
1,120m
Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride.
5.0
(2)
76
riders
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
71
riders
33.7km
02:32
230m
230m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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Tips from the Community
Fourmile Canyon Road is a popular cycling spot that connects Boulder Canyon all the way up to the "ghost town" of Gold Hill via Gold Run Road, Gold Hill Road, and the Peak to Peak Highway. This particular section of Fourmile is from Boulder Canyon to Poorman Hill Road, another popular gravel road that connects to Sunshine Canyon.
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Fourmile Canyon Road is a popular cycling spot that connects Boulder Canyon all the way up to the "ghost town" of Gold Hill via Gold Run Road, Gold Hill Road, and the Peak to Peak Highway. This particular section of Fourmile is from Boulder Canyon to Poorman Hill Road, another popular gravel road that connects to Sunshine Canyon.
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Sunshine Canyon is a popular ride that that takes you straight from downtown Boulder up into the foothills past popular hikes like Mount Sanitas and Lions Lair. This upper section of Sunshine Canyon is gravel, but it is generally well-graded, and hard packed; it is frequently completed by local cyclists on road bikes. The only place where the gravel can be a little looser and chunkier is toward the top of the canyon by Gold Hill, so be aware when ascending or descending.
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Sunshine Canyon is a popular ride that that takes you straight from downtown Boulder up into the foothills past popular hikes like Mount Sanitas and Lions Lair. This upper section of Sunshine Canyon is gravel, but it is generally well-graded, and hard packed; it is frequently completed by local cyclists on road bikes. The only place where the gravel can be a little looser and chunkier is toward the top of the canyon by Gold Hill, so be aware when ascending or descending.
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The road up Flagstaff from Chautauqua to Chapman Drive, where you can continue to Artists Point overlooking Boulder, is an iconic Boulder climb. This fun, twisting road (whether you ride up or down) grants you great views over the city as you pass by large sandstone boulders and cliffs, stands of pine trees, and several viewpoints. Watch out for cars on both the ascent and descent, this is a very popular drive for tourists and locals alike and there are several well-trafficked hiking trails off of the road.
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A general store frozen in time, in a tiny gold mining village. Great stop to refuel after riding the amazing gravel roads to get here. Make sure you check they're open.
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Super Flagstaff, or more commonly, "Super Flag," is the name of the tough climb from intersection of the road to the Flagstaff amphitheater and Artist's Point, and Chapman Drive to the true summit of Flagstaff Road, marked by a collection of mailboxes. From the bottom of Flagstaff Mountain by, Chautauqua the total ascent is 1,978 feet with the average gradient at 8.2 percent, but there is also a short, 1,000 foot section which goes at 20 percent. This infamous hill is a favorite among locals. From the top you can either turn around and head back toward town, or continue onward toward the remote-feeling Gross Reservoir on the other side of the mountain.
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Gross Reservoir is a large lake on the other side of Flagstaff Mountain. There is a hard-packed gravel road on it's eastern shore which is a great place to snap a few photos after the tough climb up Super Flag and long descent down. If you are unwilling to take you bike on gravel, however, you still get great views of the reservoir and the surrounding area at the junction on the pavement.
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Frequently Asked Questions
How many no-traffic road cycling routes are available in Boulder County?
There are over 40 dedicated no-traffic road cycling routes in Boulder County, offering a variety of experiences for different skill levels. You'll find 13 easy routes, 25 moderate routes, and 4 difficult routes to explore.
What kind of terrain can I expect on no-traffic road cycling routes in Boulder County?
Boulder County's no-traffic routes offer diverse terrain, from winding canyon roads with varying gradients to challenging climbs and scenic paths. You'll encounter a mix of paved roads and some routes, like Sunshine Canyon, Poorman Road, and Boulder Canyon loop from Pearl Street — Gravel, that incorporate gravel sections for an added challenge. The region is known for its dramatic elevation changes, especially as you approach the Rocky Mountains.
Are there any family-friendly no-traffic road cycling routes in Boulder County?
Yes, Boulder County offers several easy and moderate no-traffic routes suitable for families. While specific 'family-friendly' designations aren't always explicit, routes with less elevation gain and smoother surfaces are generally preferred. Look for routes categorized as 'easy' in the guide, which often provide a more relaxed experience.
What are the best times of year for no-traffic road cycling in Boulder County?
The best times for no-traffic road cycling in Boulder County are typically spring, summer, and fall. Spring offers vibrant landscapes, while summer provides warm weather. Fall brings stunning foliage. Always check local weather conditions, especially for higher elevation routes, as conditions can change rapidly. Winter cycling is possible, but some routes may be affected by snow or ice.
What natural features or landmarks can I see along these routes?
Many no-traffic road cycling routes in Boulder County offer stunning views of iconic natural features. You can expect to see the majestic Flatirons, part of the Fountain Formation, which are Boulder's most recognizable natural landmark. Routes often pass through picturesque canyons like Lefthand Canyon, Eldorado Canyon, and Boulder Canyon Drive. You might also catch glimpses of the Indian Peaks and Continental Divide, especially from higher vantage points like the Continental Divide Overlook.
Are there any loop routes for no-traffic road cycling?
Yes, Boulder County features several excellent loop routes for no-traffic road cycling. For example, the Sunshine and Fourmile Canyons to Gold Hill loop offers a challenging ride with significant elevation gain, while the Chapman Drive and Flagstaff Mountain Loop provides a moderate option with scenic views.
What do other road cyclists enjoy most about no-traffic routes in Boulder County?
The komoot community highly rates the no-traffic road cycling routes in Boulder County, with an average score of 4.8 stars from 144 reviews. Cyclists often praise the breathtaking scenery, the challenging climbs, and the feeling of immersion in nature away from vehicle traffic. The diverse terrain and well-maintained paths are also frequently highlighted as major positives.
Are there any routes that offer views of lakes or reservoirs?
Yes, some routes provide views of the region's beautiful water bodies. For instance, the challenging Flagstaff Mountain to Gross Reservoir route leads you towards Gross Reservoir, offering scenic vistas. Other nearby lakes and preserves include Brainard Lake and Boulder Reservoir, which are popular spots in the area.
What are some challenging no-traffic road cycling routes for experienced riders?
Experienced riders seeking a challenge will find several difficult no-traffic routes. The Sunshine and Fourmile Canyons to Gold Hill loop, with over 1000 meters of elevation gain, is a prime example. Another demanding option is the Flagstaff Mountain to Gross Reservoir route, which features significant climbing and rewarding views.
Are there any gravel sections on the no-traffic road cycling routes?
While the focus is on road cycling, some routes in Boulder County incorporate gravel sections, offering a mixed-surface experience. For example, Sunshine Canyon, Poorman Road, and Boulder Canyon loop from Pearl Street — Gravel and The Boulder Roubaix Course — Gravel are specifically designed with gravel portions, catering to riders who enjoy varied terrain.
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