Boulder, CO: Green Mountain via Gregory Canyon

Pine-dotted canyons, a gurgling creek, and summit views of Rocky Mountain National Park highlight this 5.4-mile dayhike near Boulder.

Hike west from the trailhead through open conifer forest. The trail climbs up Gregory Canyon, paralleling Gregory Creek. After a mile, the terrain flattens briefly as the path curves around a forested ridge, then travels south. At mile 1.4, bear left at trail fork and hike southeast up a small drainage. The route turns right onto the Ranger Trail and ascends Green Mountain's northwest ridge .2 mile later—savor views of wooded ridgelines to the northwest across Panther Canyon. The trail crests the boulder-strewn summit of Green Mountain at mile 2.7. Scale the summit's largest boulder to sign the register and to find views of Rocky Mountain National Park and the Indian Peaks.

-Mapped by Kim Phillips and Jason Stevenson

Trail Facts

  • Distance: 4.3
  • Miles from Denver city center: 29



Location: 39.9974555969238, -105.292816162109

From parking area, head west on dirt trail. Path climbs through Gregory Canyon, paralleling Gregory Creek.


Location: 39.9973411560059, -105.305946350098

Terrain flattens briefly as the trail curves around a forested ridge; follow path to the southwest through conifer forest.


Location: 39.9961814880371, -105.308074951172

Keep straight @ 3-way, heading south.


Location: 39.9933776855469, -105.307991027832

Bear left @ Y-junction. Trail climbs to the southeast up drainage.


Location: 39.9906158447266, -105.30509185791

Turn right @ T-junction on the Ranger Trail; continue climbing.


Location: 39.9878807067871, -105.306465148926

For the next .4 mile, trail climbs up ridge overlooking Panther Canyon.


Location: 39.9842948913574, -105.302513122559

Trail switchbacks to the right, hugging slopes. Look to the left for views of Green Mountain's rocky summit.


Location: 39.9828720092773, -105.303741455078

Turn left (southeast) for final .2-mile climb to the summit.


Location: 39.9821128845215, -105.301490783691

Green Mountain (8,144 ft.): Giant boulders enclose Green's summit. Scale boulder on summit's northwest side to sign register found in the 4-foot cairn. A 3-D metal peak finder on top of the cairn lists surrounding peaks. Views of Rocky Mountain National Park to the northwest, the Indian Peaks to the west, and Boulder to the northeast. Retrace route to trailhead.