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Mount Sanitas Trail

 4.3 (12)

1.3 Miles 2.1 Kilometers



1,282' 391 m


-3' -1 m



Avg Grade (11°)


Max Grade (23°)

6,792' 2,070 m


5,513' 1,680 m


Shared By Megan W


All Clear 12 days ago
~20 ft dirt-covered snow on East Ridge segment, easy to avoid by walking on rocks. Also ~30ft mud at top of valley trail. History

Getting forecast...

Mega-popular Boulder classic that is sure to get your blood pumping

Megan W

Dogs Unknown

Features Views · Wildflowers · Wildlife

Runner Notes

This steep trail makes extensive use of log steps and rocky ledges, some sections may be too steep for continuous running. To reduce frustration, avoid the peak hours as this trail is popular and it is hard to safely pass other users.


A short path east from the Centennial trailhead and parking area along the north side of Sunshine Canyon Drive takes users to a picnic pavilion next to a stream. Pass through the pavilion, cross the concrete bridge and head left and uphill through a small meadow. Signage marks the official start of the Mount Sanitas Trail where it crosses the Silver Lake Irrigation Ditch.

The trail contours around the west flank of Mount Sanitas, climbing steeply up wooden stairs and rock ledges to gain elevation in a hurry. The difficult ascent rewards with views down into Sunshine Canyon and west to the impressive Indian Peaks. Pass below short cliffs popular with bouldering climbers and spot their favorite routes by looking for white, chalky holds.

The terrain mellows slightly as it reaches the Mount Sanitas ridge and then meanders back and forth along its spine. Clamber ever upwards catching glimpses of false summits and the city below. Much of the middle section of this trail consists of rock steps clinging to the sunny hillside. The remainder of the trail climbs steadily to the summit past ponderosa pines and springtime wildflowers.

One final push and you find yourself on top of the rocky summit outcrop. Settle down for a well deserved rest with the all the other sweaty trail runners, hikers and their very fit dogs. Enjoy the best views of Boulder laid out to the east, as trees partially obscure views in other directions.

Flora & Fauna

Note that mountain lions and bears pass through this area and although rangers do their best to put up warning signs about recent activity, dawn and dusk are the times to be most aware.

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Your Check-Ins


Sep 16, 2017
Jul 6, 2017
Jen McMurtrey
Mar 13, 2017
Mr Singleton
1.3mi — 0h 26m
Sep 1, 2016
Kevin Gravina
good condition 1.3mi
Aug 9, 2015
Gus Delaporte

Trail Ratings

  4.3 from 12 votes


  4.3 from 12 votes
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in Colorado


37 Views Last Month
2,656 Since Nov 7, 2014
Intermediate/Difficult Intermediate/Difficult

It is a bit of a stretch to call Mount Sanitas trail one for trail running. Extremely steep and very rocky much of the way. That being said, it is a great workout even if you wind up walking at least half of it, as I did. Shaded most the way, and great views of Boulder from summit. Apr 20, 2017

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