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Mount Sanitas Loop

 50 votes

3.2 Miles 5.2 Kilometers


100%

Singletrack

1,281' 390 m

Ascent

-1,280' -390 m

Descent

6,780' 2,067 m

High

5,521' 1,683 m

Low

15%

Avg Grade (9°)

43%

Max Grade (23°)

Minor Issues

18 days agoUpdate

Very popular and scenic loop right from the edge of town.

Nick Wilder

Overview

This is a steep but rewarding trail, with great summit views of the foothils to the high peaks, and all of Boulder. It is virtually always crowded with all kinds of runners, hikers, and dogs.
Features: Views
Dogs: Off-leash

Need to Know

In typical Boulder fashion, there are some crazy speed records on the various trails.

Description

From the beginning of the Sanitas Valley Trail, take your first left on the Mount Sanitas Trail and immediately start the very steep ascent of the mountain. The trail is mostly shaded, but there are tons of high steps, both on logs and boulders, which make the trail tiring. You'll pass some large rock outcroppings that are popular with climbers and boulderers and several nice places to rest and enjoy the views both east and west.

After several false summits, you finally gain the true summit and have unobstructed views of all of Boulder to the east, and partially obstructed views of foothills and Indian Peaks to the west.

Head down the very steep East Ridge Trail, which has several tricky sections of steep rock. It eases up as you descend, and finally widens and becomes much easier as you get to a saddle and intersection with the Sanitas Valley Trail.

As you descend this nice, easy gravel road, enjoy the spectacular views of the Flatirons, seen from a unique side-on angle. You'll pass the historic Silver Lake ditch (which supplies water to Boulder farmers and has been in use since the late 1800's) and soon end back where you started.

Flora & Fauna

Mountain lions are common in the area, and the trail is occasionally closed if there is a fresh kill. You'd be lucky to see one though!

History & Background

The peak is named for the Boulder Sanitarium that sat at the current site of the Boulder Community Hospital. The building was completed in 1896 and was primarily used to treat tuberculosis patients. The original smokestack still stands.

There is also an old quarry halfway up the slope (a spur trail will lead you there) that was used for several early University of Colorado buildings.

Contacts

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4.1 from 50 votes


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Check-Ins

Nov 26, 2017
Jeff spiegel
Nov 19, 2017
Allison Klein
With Tiffany and Nikki
Nov 18, 2017
Nick George
Nov 13, 2017
Paul Snyder
Nov 10, 2017
Ryan Wadge
Oct 29, 2017
Kaitlin Fier
Oct 25, 2017
fgt ncg
1mi
Oct 24, 2017
Mike G

Trail Ratings

  4.1 from 50 votes

#36

Overall
  4.1 from 50 votes
5 Star
30%
4 Star
50%
3 Star
18%
2 Star
2%
1 Star
0%
Rankings

#11

in Colorado

#36

Overall
340 Views Last Month
4,871 Since Nov 15, 2014
Intermediate/Difficult Intermediate/Difficult

0%
2%
34%
55%
9%
0%

Conditions


Minor Issues 18 days ago
Snowy: On the east loop there's snow on the trail. It's manageable in running shoes if you take your time. Otherwise spikes.
Update ConditionsHistory

Getting forecast...

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