Trail Run Project Logo

Grizzly Lake

Aspen, CO

Hit your stride on new trails

Get out on the trail with detailed maps shared by runners like you.

Explore 213,291 miles of Running Trails

Difficulty
Easy Difficult
Distance
mi
 - 
mi
Rating
Distance
mi
 - 
mi
Difficulty
Easy Difficult
Rating
Popular Near Here
Zoom in to see details
Map Key

Maps as mobile as you are

Never lose the trail, even if you lose your cell signal. Our app was designed to work offline.

Get the Free App

Add your favorite trails

Join the thousands of runners who’ve shared their most treasured trails with the Trail Run Project community.

Add a Trail

Upcoming Races

View All
81.5 mi 131.2 km Salomon Xreid 2019
Jun 28, 2019
Voss, NO
81.5 mi 131.2 km Voss, NO Jun 28, 2019
96.9 mi 156.0 km Western States Endurance Run
Jun 29, 2019
Sunnyside-Tahoe City, CA
96.9 mi 156.0 km Sunnyside-Tahoe City, CA Jun 29, 2019
27.3 mi 43.9 km Lost Turkey Trail Marathon
Jun 29, 2019
Windber, PA
27.3 mi 43.9 km Windber, PA Jun 29, 2019
7.2 mi 11.5 km Hell Hath No Hurry Course (modified)
Jun 29, 2019
Rennerdale, PA
7.2 mi 11.5 km Rennerdale, PA Jun 29, 2019
3.2 mi 5.2 km Mt. Marathon Race Course
Jul 4, 2019
Seward, AK
3.2 mi 5.2 km Seward, AK Jul 4, 2019

Trail Directory

213,291 miles in 63,905 trails, added by runners like you. Share your runs, trails, and photos!


International