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Alert: Major flooding has prompted evacuations and is impacting communities and public lands across Western Washington. Landslide risk and related hazards are very high and have closed trails and roads, including major highways and forest roads.

Check forecasts, consider delaying your hiking or camping plans, and stay safe out there. 

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Osborne Mountain

South Cascades
Length
10.7 miles, roundtrip
Elevation Gain
3,474 feet
Highest Point
4,920 feet
Calculated Difficulty About Calculated Difficulty
Hard
  • Dogs allowed on leash
  • Mountain views
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22 trip reports for this trail

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Hiking Osborne Mountain

Osborne Mountain

Map & Directions

Before You Go

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.

More Hike Details

Trailhead

South Cascades

Osborne Mountain (#250)

News

Hiker Headlines: Widespread flooding impacts communities and closes roads, trails and campgrounds

December 11, 2025

Learn

Angry Mountain: One trail's role in a sustainable system

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Osborne Mountain

22 Trip Reports

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Trip Reports