By region
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Featured resource: a lot of the routes below (marked GBA) come from Gravel Bike Adventures — an incredible, community-run resource for Colorado gravel routes. Worth a browse beyond what's listed here.
Front Range & Boulder County
Denver · Boulder · Golden · Longmont · Niwot · Lafayette · Commerce City39.5 mi1,732 ft gain
Niwot, Erie & Louisville Gravel Loop
Boulder County
A rolling farm-road loop connecting Niwot, Erie, Louisville, and Gunbarrel — a good measuring-stick ride for the Front Range plains.
46 mi3,970 ft gain
Peak to Peak Gravel — Nederland & Rollinsville
Boulder foothills
Climbs into the foothills west of Boulder for mountain views without a full alpine commitment. Rated hard for the vertical gain.
32.5 mi2,156 ft gain
North Table, Blunn Reservoir & South Table Loops GBA
Golden
Starts near downtown Golden and links the mesa-top loops atop North and South Table Mountain, with Blunn Reservoir in between — easy gravel and singletrack with big views.
33.1 mi1,053 ft gain
Boulder Reservoir and Open Sky Loop GBA
Boulder
A Boulder-area loop past the reservoir and out into open space — flat, fast, and a good one for a shorter afternoon ride.
22.6 mi2,077 ft gain
Buffalo Creek Gravel Lollipop GBA
Buffalo Creek, near Pine
A lollipop-shaped route through the Buffalo Creek recreation area southwest of Denver — forested gravel roads with a loop at the far end.
33.6 mi965 ft gain
Dirty Chatfield Loop + Waterton Canyon GBA
Chatfield / Waterton Canyon, Denver
Combines the gravel around Chatfield with an out-and-back into Waterton Canyon, right at the mouth of the Platte River Canyon.
41.9 mi3,017 ft gain
Douglas County East/West Trail to the Bluffs GBA
Douglas County
Follows the East/West Regional Trail through Douglas County out to the Bluffs — rolling gravel and singletrack south of the metro area.
22.2 mi302 ft gain
Rocky Mountain Arsenal Gravel Loop GBA
Commerce City
A great starter ride on the gravel roads of the Rocky Mountain Arsenal National Wildlife Refuge — flat, wide, and wildlife-watching along the way.
21.3 mi3,214 ft gain
Sunshine & Fourmile Canyon to Gold Hill
Boulder
Climbs out of Boulder up Sunshine or Fourmile Canyon to the historic mining town of Gold Hill. Refuel at the Gold Hill General Store & Pub — a general store that's been standing since 1873.
31.1 mi1,495 ft gain
Stem Acreage Loop
Lafayette
Stem Acreage is the place to start and finish this one, with post-ride food and beverages on site.
Central Mountains
Buena Vista · Salida · Breckenridge25 mi2,175 ft gain
Cottonwood Lake Road GBA
Buena Vista
A quintessential Chaffee County sampler — starts at Buena Vista's main stoplight and ends at a mountain lake.
33.6 mi2,877 ft gain
Boreas Pass Road GBA
Breckenridge to Como
A graded two-wheel-drive dirt road climbing over historic Boreas Pass, connecting Breckenridge to the tiny town of Como.
18.7 mi612 ft gain
Railroad Tunnel / River Road
Buena Vista
An easy ride right next to Buena Vista along the old railroad grade — a good option for a shorter or lower-effort day.
Rocky Mountain National Park & Estes Park
Old Fall River Road29.7 mi4,101 ft gain
Old Fall River Road GBA
Rocky Mountain National Park
A historic unpaved road climbing into RMNP — best ridden right before it opens to cars for the season or right after it closes, when it's quietest.
Gunnison Valley
Crested Butte · Gunnison40+ miHigh desert
Hartman Rocks
Gunnison
Three miles from town, with 40+ miles of gravel and dirt roads winding through high-desert rock formations.
27.7 mi2,746 ft gain
Ohio Pass to Lake Irwin GBA
Gunnison
An alpine out-and-back through open green meadows and ranches with picture-perfect barns, ending at a remote mountain lake. About 2,750 ft of climbing, mostly gravel.
Western Slope
Grand Junction · De Beque64 mi5,417 ft gain
Gravel Grinder from Colorado National Monument GBA
Grand Junction
A big lollipop starting at Saddlehorn Campground, with serious scenery and terrain above 9,000 ft. About 5,400 ft of climbing, half gravel and half paved — best in June or fall.
35 mi3,980 ft gain
Land's End Gravel Climb GBA
Grand Junction
An out-and-back that climbs nearly 4,000 ft in the first 13 miles at a steady 6% grade, with spectacular views of the Grand Mesa. About 90% gravel.
44.6 mi3,668 ft gain
De Beque Gravel Loop GBA
De Beque
A remote high-desert loop through colorful rock formations and hoodoos. About 3,670 ft of climbing, 92% gravel.
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Full Western Slope route index
Grand Junction area & beyond
A searchable map of the region's gravel roads if you want to go exploring beyond this list.