ElevationAscent: 970' 296 m
Descent: -970' -296 m
High: 5,960' 1,817 m
Low: 5,522' 1,683 m
GradeAvg Grade: 2% (1°)
Max Grade: 13% (7°)
Popular runs nearby
Marshall Mesa to Spring Brook Loop
11.1 mi 17.9 km • Loop • 893 ft Ascent 272.24 m Ascent
South Mesa Loop
3.1 mi 5.0 km • Loop • 508 ft Ascent 154.7 m Ascent
Boulder Skyline Traverse
16.3 mi 26.3 km • Point to Point • 5,409 ft Ascent 1648.56 m Ascent
3.9 mi 6.3 km • Loop • 831 ft Ascent 253.22 m Ascent
Flagstaff Summit Loop
2.4 mi 3.9 km • Loop • 346 ft Ascent 105.4 m Ascent
Mount Sanitas Loop
3.2 mi 5.2 km • Loop • 1,281 ft Ascent 390.4 m Ascent
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“A rare, long, flat-ish loop on dirt in the Front Range, named after the Morgul Bismarck road cycling route.”— Amanda Stone
Please be courteous in regards to trail closures. Large portions of this trail are clay and are therefore easily damaged while wet. Check this website for any current closures: maps.bouldercolorado.gov/os…?
Some of the parking areas require Boulder County license plates or a user fee for cars registered outside of the county.
The trail can get hot and windy as there is no tree cover. Parts of the singletrack on the west side can become very muddy with rain or snow.
This is a popular MTB route with many beginners, so try to be understanding of the many users on this trail.
Start by heading east on Marshall Valley. You'll come to the intersection with Community Ditch, but stay straight to head east on Cowdrey Draw. You'll cross a small side road where the trail turns into Mayhoffer Singletree. Keep following the obvious route. This turns into Meadowlark. At the bottom of the hill is a small parking lot with restrooms.
From here, turn right to climb up the doubletrack Coalton. Watch for cows and prairie dogs. Coalton will take a sharp left at the top of the hill and wind back toward 128 where you'll find another small parking area. From here, the trail becomes the High Plains trail with finally some nice flowing singletrack.
At the end of this singletrack section is the Greenbelt Plateau parking area. At the parking area, turn right to follow the doubletrack up the hill. At the very end of Greenbelt Plateau you'll encounter a small rock feature and intersect with
Community Ditch. Turn left onto Community Ditch until you reach the intersection for Coal Seam. Take a hard right to follow the slightly rock Coal Seam back down to the Marshall Mesa Trail.
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Land Manager: Boulder County, CO - Parks and Open Space