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Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain Trailhead
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Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain Trailhead

 
Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain Trailhead

Page Type: Route

Location: Colorado, United States, North America

Object Title: Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain Trailhead

Route Type: Hiking

Season: Spring, Summer, Fall, Winter

Time Required: Most of a day

Difficulty: Class 2

Route Quality: 
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Page By: tomlauren

Created/Edited: Sep 27, 2009 / May 5, 2010

Object ID: 557811

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Overview

 
Approaching the summit of Mt Patterson from Nisa Mountain
Approaching the summit of Mt Patterson from Nisa Mountain.

This link-up combines Green Mountain, Nisa Mountain, and Mount Patterson into one outing. This page describes the route starting with Green Mountain, but it can easily be reversed to start with Mount Patterson.

Getting There

Start at the Green Mountain Trailhead.

Route Description

Stats: Class 2, 7.3 miles (round trip), 3758 feet of elevation gain.

From the Green Mountain Trailhead follow the Green Mountain Trail for approximately 0.6 miles until you see a marsh on the south side of the trail. The coordinates of this point are 40.310133°N / 105.831783°W. Cross the marsh and head up Green Mountain's forested northwest slope to the summit of Green Mountain.

From the summit of Green Mountain, descend Green Mountain's southeast slope to the Tonahutu Creek Trail at an elevation of 9320 feet and a point where you can cross Tonahutu Creek. There is a fallen tree here which allows passage across the river. The coordinates of this point are 40.291583°N / 105.813133°W. In "RMNP The Complete Guide" by Lisa Foster, the author recommends crossing the creek at an elevation of 9200 feet (0.2 miles farther south). In late June of 2009 I inspected that area for safe passage across the river, but the water level was too high and the river too narrow and deep to cross the raging Tonahutu at that point. That is why I recommend crossing at the coordinates which I provided.

After crossing Tonahutu Creek, gain 1400+ vertical feet as you hike one mile up Nisa Mountain's northwest ridge to its summit.

From Nisa Mountain's summit, head east for 0.3 miles to the saddle between Nisa Mountain and Mount Patterson, then hike for an additional 0.9 miles gaining 800 vertical feet as you head up Mount Patterson's southwest slope to the summit of Mount Patterson.

From the summit of Mount Patterson, descend Mount Patterson's northwest ridge to a saddle between it and Point 11,008, then climb to the top of Point 11,008. Descend Point 11,008 to the west, eventually arriving at Big Meadows. Less than 0.1 miles south of where the Green Mountain Trail meets the Tonahutu Creek Trail there is a bridge which crosses Tonahutu Creek. Cross the bridge to get to the Tonahutu Creek Trail, head north for 0.1 miles to the Green Mountain Trail, then take the Green Mountain Trail west for 1.8 miles back to the trailhead.

Trail Profile and Map

The trail color represents the class of that portion of the trail.

Green = Class 1
Blue = Class 2

Trail Profile

The vertical unit is feet, and the horizontal unit is miles.
 
Trail Profile of Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain Trailhead
 


Map
 
Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain Trailhead
Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain TH.

Images

Approaching the summit of Mt Patterson from Nisa MountainTrail Profile of Green Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain TrailheadGreen Mountain, Nisa Mountain, and Mount Patterson from the Green Mountain Trailhead