Trails for everyone, forever

Home Go Hiking Hiking Guide Humpback Mountain

Humpback Mountain

Snoqualmie Region > Snoqualmie Pass
47.3784, -121.5162 Map & Directions
4.0 miles, roundtrip
Elevation Gain
2,600 feet
Highest Point
5,112 feet
Calculated Difficulty About Calculated Difficulty
  • Mountain views
  • Dogs allowed on leash
  • Summits
  • Ridges/passes

An unmaintained trail that climbs steeply up the shoulder of Humpback Mountain to an infrequently visited summit on a massive pile of boulders. Continue reading

3.79 out of 5

(14 votes) Log in to rate

Hiking Humpback Mountain

Humpback Mountain is easily visible from I-90, but rarely visited due to the lack of a maintained trail. Nonetheless, it's a worthy destination to stay out of the sun or rain. The trail starts at a gated road FS road 5510-120. (There are often cars parked outside the gate, but they are usually gem hunters. There are multiple claims in this area, so don't dig unless you have permission.)

The trail follows the abandoned road, gaining 250 feet in 0.6 of a mile to the shoulder of the mountain. Along the way, pass by an old quarry and consider bringing a garbage bag to clean up after others.

Just past the shoulder, find the trail that climbs 500 feet in a quarter mile to intersect with FS road 5510-110. The trail continues on the other side of the road and enters new growth forest. The way here is easy to follow, but dark even on sunny days. In a quarter mile, the forest abruptly changes to second growth, but the slope doesn't ease.

The trail continues its steady climb through the trees until 1.6 miles where the southwest slope becomes a huge rock field. The trail only skirts the rocks until gaining the summit ridge. The last tenth of a mile is a scramble over huge boulders with stunning views south to Mount Rainier, north to the Alpine Lakes, and east to Annette Lake and Silver Peak.

Humpback Mountain

Map & Directions

Co-ordinates: 47.3784, -121.5162 Open in Google Maps

Before You Go

See weather forecast

WTA Pro Tip: Save a copy of our directions before you leave! App-based driving directions aren't always accurate and data connections may be unreliable as you drive to the trailhead.

Getting There

From I-90, take exit 47 for Denny Creek. Go south across the river and left on Tinkham Road. In 1.3 miles, turn left on Hansen Creek Road 5510. After 1.6 miles, park outside the gate for FS Road 5510-120.

More Hike Details


Snoqualmie Region > Snoqualmie Pass

Mt. Baker-Snoqualmie National Forest, Snoqualmie Ranger District

Guidebooks & Maps

Greentrails 207S

You can improve or add to this guidebook entry

Humpback Mountain

170 Trip Reports

Hiked here recently?

Submit a trip report!
Trip Reports