Humpback Mountain (winter)

Humpback Mountain in winter is an easily-accessible I-90 corridor peak, relatively avalanche safe, with views to the east and north. The upper ridge line is narrow and easy to follow.


The standard route is, as in other seasons, via the northwest ridge. Since the roads are normally not plowed much beyond I-90, the distance and elevation gain are substantially higher than in summer. Eight miles round-trip with over 3,200 ft gain.

FOr leaders

Permit information

As of 2017, the Snoqualmie Ranger District considers Mountaineers trips and courses to be "nominal use". Leaders should print and copy this designation letter to show rangers they may see on trail.

  • Difficulty: Winter Scramble
  • Length: 8.0 mi
  • Elevation Gain: 3,200 ft
  • 5,174 ft
  • USGS Lost Lake
  • Red Marker
    47.393121, -121.481860
    47.3931205253 -121.481859684
  • Red Marker
    47.372395, -121.495051
    47.3723951214 -121.495051485

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