Near Sourdough Mountain Trail
It was a tough climb but totally worth it for the 360 degree views.
Near Sourdough Mountain Trail
The view from the top of Sourdough Mountain.
Near Sourdough Mountain Trail
Panorama from the lookout. Does not do justice to the absolute beauty of this veiw..
Near Sourdough Mountain Trail
The lookout is no longer open to the public for safety reasons...
Near Sourdough Mountain Trail
Ross Lake from about halfway up to the lookout on Sourdough Mountain.

Looking for more photos?

View All Photos
Driving Directions
Hike Trail

Sourdough Mountain Trail

4.9 (14 Ratings)
A great climb leading to some spectacular views.
9.8
mi
Distance
5,476
ft
Gain
strenuous
Difficulty
Fall ColorsLakeRiver/CreekViewsWildflowersWildlife
Access Issues
CLOSED: The portion of trail from Diablo Trailhead to Sourdough Lookout is closed until further notice due to wildfire damage.

Route Details

Flatter
Steeper
9.84mi
Distance
5,476ft
Elevation Gain
4,398ft
Elevation Loss
40%
Max Grade
5,979ft
High Point
896ft
Low Point
Path Type
Point to Point
Description
This is a great trail, not too difficult but be prepared for a steady uphill! The trail starts behind the old basketball court in the town of Diablo. Your route will start right up the mountain, and the trail stays true to its beginnings... up,up,up. The trail itself is in good condition, smooth and shaded for the first half or more. Then it becomes open and exposed for the rest of the trip. The last water source is Sourdough Creek, so fill up there or pay the consequences at the top! The views from the summit have got to be some of the best in the whole of the North Cascades National Park. The views are well worth every drop of sweat it takes to see them. Once you've enjoyed your fill of the summit, you can head down the backside of Sourdough Mountain. The trail on this side of the mountain is still plenty steep, but there will be spots where you'll get some respite. Enjoy the views of Ruby Lake as you work your way down the the water's edge, though the trail is heavily forested, and a clear view may be difficult to find. From the end of this trail, you can spend the night at the Cougar Island Campground, or you can retrace your steps for a long return to Diablo.

Route Conditions

Report Conditions
No Condition Reports
Report Conditions

Nearby Hike Routes

Sourdough Lookout

Hike Route

Sourdough Lookout

Views
extreme
10.12 mi
+5,104 ft
Sourdough Mountain Lookout

Classic Hike Route

Sourdough Mountain Lookout

Fall Colors
strenuous
10.13 mi
+5,104 ft
Thunder Knob

Hike Route

Thunder Knob

Views
easy
0.08 mi
+13 ft
Thunder Knob

Classic Hike Route

Thunder Knob

Family Friendly
moderate
3.48 mi
+650 ft
Pacific Northwest National Scenic Trail Section 10

Hike Route

Pacific Northwest National Scenic Trail Section 10

Lake
extreme
90.65 mi
+16,516 ft
Ladder Creek Falls

Hike Route

Ladder Creek Falls

Family Friendly
easy
0.52 mi
+229 ft
Contributors
Chris Liebich