Seattle: Tumac Mountain

This 8-mile out-and-back to a pair of volcanic Cascades cones comes with dozens of colorful wildflower meadows and chilly alpine tarns.
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This 8-mile out-and-back to a pair of volcanic Cascades cones comes with dozens of colorful wildflower meadows and chilly alpine tarns.

Trail Facts

  • Distance: 6.5

Waypoints

TUM001

Location: 46.7523994445801, -121.36164855957

Head SW on Trail 980; cross small creek on bridge and continue S

TUM002

Location: 46.7451210021973, -121.364562988281

Trail begins steep climb with views opening E toward Mt. Aix

TUM003

Location: 46.7381896972656, -121.36856842041

Arrive @ the first Twin Sisters Lake. Go L (R leads to second Twin Sisters Lake); ford outlet creek

TUM004

Location: 46.7333717346191, -121.364776611328

Turn R @ Y onto Tumac Mtn.'s Trail 44 and continue S

TUM005

Location: 46.7280731201172, -121.36075592041

Lush open meadows dotted with dozens of small tarns; wildflowers galore

TUM006

Location: 46.7207450866699, -121.357841491699

More meadows of flowers, and more ponds. Elk tracks follow trail

TUM007

Location: 46.7162666320801, -121.355674743652

SE views to Pear Butte. Hike through huckleber­ries in fall, and beargrass and avalanche lilies in early summer

TUM008

Location: 46.7135848999023, -121.353759765625

Steep trail up pumice slopes toward summit. Stay straight @ 3-way. Optional: Turn R on faint path to explore deep concentric circles of lower Tumac Mtn. crater

TUM009

Location: 46.7131690979004, -121.355766296387

Upper crater: Gaze into the lower crater before turning SE to summit

TUM010

Location: 46.7122764587402, -121.353065490723

Tumac Mtn. (6,340 ft.) offers fantastic 360° views of Goat Rocks Wilderness; Mts. Adams, St. Helens, and Rainier; and on superfine days, even the Stuart Range and Olympics. Return to trailhead