Trail · North Cascades National Park
Sourdough Mountain Trail
20.7 mi round trip8,969 ft gainVery hardDay hike: No permitOvernight: Reservation
Get alerts for this hikePermits and reservations
Day hikeNo permit
Day hikes in the national park need no permit or reservation.
OvernightReservation
Every overnight stay needs a wilderness permit, year-round. Reserve on Recreation.gov or walk up in Marblemount.
Permit calendar
Early-access lotteryEarly March
Winners bookLate March to April
General reservationsLate April
Walk-up permitsMid-May to early October
North Cascades National Park rules from the National Park Service. Exact dates are set each year; past years followed this pattern. Always confirm with the land manager before you go.
About the trail
Distance20.7 miRound trip, out and back
Elevation gain8,969 ftTotal climb, round trip
High point5,970 ftFrom elevation data
Overview
Sourdough Mountain Trail is a 20.7-mile round trip, out and back from Sourdough Trailhead. The route follows Sourdough Mountain Trail.
Photos from hikers
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What you need
Parking and passes
National park trailheads here have no entrance fee. Check posted signs for any parking rules.
Getting there
The hike starts at Sourdough Trailhead. Save directions offline before you leave, since mountain roads often lose cell service.