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Sourdough Mountain


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Sourdough Mountain

A very strenuous, 11-mile round trip hike with 5,085 feet of elevation gain in the North Cascades. The trail heads up steeply and steadily through forests and meadows to an old lookout with amazing views of the Cascades.

Temporary Closure

11/6/23 Update: Due to the 2023 Sourdough Fires, the Sourdough Mountain Trail remains closed until further notice. Visit the Fire Closures page on North Cascades National Park website for current details and full information.

getting there

Drive SR 20 to Gorge and  Diablo Lakes. Take the left fork onto Diablo St. just before crossing the bridge across Gorge Lake. Continue 0.7 mile and bear right, staying on Diablo St. just after crossing the bridge across Stetattle Creek. Drive 0.25 mile to the trailhead (900 ft). Park on the right side of the street.

information for leaders

Courses, paid clinics, staff-led programs, and course field trips require a Commercial Use Authorization. The Park typically accepts applications for 2-year CUAs  through mid-March each year, and CUA's are activity-specific. Please contact info@mountaineers.org if you would like to apply for a CUA for a field trip or paid clinic for an activity we do not already have a CUA for. Please follow all Mountaineers group guidelines when leading trips or courses in North Cascades National Park. 

Notes:

  • Leaders are responsible for securing backcountry permits or other required permits even if  we have a CUA.
  • Leaders must have all relevant CUAs with them in paper or electronic copy to show Parks Staff as requested. 
  • All Hiking course field trips or paid clinics must have a First aid and CPR certified leader. Current (non-expired) certificates must be uploaded to the park web portal by Mountaineers staff prior to the trip
  • All mountaineering field trips or paid clinics must have a WFR-certified leader and a leader with documented climbing certifications (an AMGA certification OR Mountaineers climb leader with a recent resume of training and experience). Both qualifications must be uploaded to the park web portal by Mountaineers staff prior to the trip

View list of current North Cascades CUAs

  • Suitable Activities: Day Hiking, Scrambling
  • Seasons: June, July, August, September, October
  • Weather: View weather forecast
  • Difficulty: Very Strenuous, Winter Scramble
  • Length: 11.0 mi
  • Elevation Gain: 5,085 ft
  • 5,985 ft
  • Land Manager: North Cascades National Park
  • Parking Permit Required: National Park Entrance Fee
  • Recommended Party Size: 12
  • Maximum Party Size: 12
  • Maximum Route/Place Capacity: 12
Map
  • Green Trails Diablo Dam No. 48
  • Trails Illustrated North Cascades National Park
  • USGS Diablo Dam
Activities
Trip Reports
Resources

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