Green Mountain via Gregory Canyon
A loop to the top of Boulder's most iconic mountain.
Severe Trail Running
- Distance
- 7.7 km
- Ascent
- 707 m
- Descent
- 707 m
Boulder
Explore Boulder with curated guides of the best hiking trails, trail running routes, and more. With over 16 3D trail maps in FATMAP, you can easily discover and navigate the best trails in Boulder.
No matter what your next adventure has in store, you can find a guide on FATMAP to help you plan your next epic trip.
Get a top trail recommendation in Boulder from one of our 3 guidebooks, or get inspired by the 16 local adventures uploaded by the FATMAP community. Start exploring now!
Routes in Boulder
Mount Sanitas
A quintessential Boulder trail run.
Severe Trail Running
- Distance
- 4.9 km
- Ascent
- 386 m
- Descent
- 386 m
Green Mountain via Gregory Canyon
A loop to the top of Boulder's most iconic mountain.
Severe Hiking
- Distance
- 7.7 km
- Ascent
- 707 m
- Descent
- 707 m
Central Flatirons + Bear Canyon
Linking the central flatiron run to green summit and down bear canyon
Extreme Trail Running
- Distance
- 15 km
- Ascent
- 849 m
- Descent
- 849 m
Mount Sanitas
A quintessential Boulder hiking route.
Severe Hiking
- Distance
- 4.9 km
- Ascent
- 386 m
- Descent
- 386 m
Mesa Trail
A spectacular but technically easy trail hanging high above Boulder
Moderate Hiking
- Distance
- 11 km
- Ascent
- 416 m
- Descent
- 394 m
First and Second Flatirons
A scrambly jaunt to the top of the First and Second flatirons.
Severe Trail Running
- Distance
- 4.3 km
- Ascent
- 444 m
- Descent
- 444 m
First and Second Flatirons
A scrambly hike to the top of the First and Second flatirons.
Severe Hiking
- Distance
- 4.3 km
- Ascent
- 444 m
- Descent
- 444 m
Guidebooks in Boulder
7 routes · Hiking
Denver Day Trip: Top 7 Scenic Hikes
6 routes · Alpine Climbing · Hiking
6 of the Best Challenging Hikes near Denver
7 routes · Hiking