A 101-mile PCT loop through the Cascade lakes between Mt. Jefferson and Mt. Hood
Other trail races within 93 miles
Mountain Lakes 100 is a 101-mile loop through the heart of the Oregon Cascades, running almost entirely on the Pacific Crest Trail between Mount Jefferson and Mount Hood. Starting and finishing at Olallie Lake Resort, the course winds through a stunning landscape of alpine lakes, old-growth forest, and terrain still recovering from the 2020 Lionshead fire. With 11,700 feet of gain and loss, technically rocky sections, remote wilderness stretches with no cell service, and a 30-hour cutoff, the race rewards with jaw-dropping scenery, dozens of Cascade lakes, and exceptional volunteer support. Go Beyond Racing's mandatory 8-hour trail work requirement reflects the organization's deep commitment to the trails it uses.
Experienced ultrarunners
Olallie Lake, OR, United StatesSeptember 19, 2026
All entrants and waitlisters must complete 8 hours of trail work (maintenance or new trail development — not litter pickup) anywhere in the world. Work must be performed after October 1 of the prior year and submitted via a signed form to the race by September 1. Entrants without completed hours forfeit their spot on September 2.
Qualifying period: October 01, 2025 – September 01, 2026
Submission deadline: September 01, 2026
| Location | Mile | Elevation |
|---|---|---|
Start Start | 0.0 | 4,961 ft |
Olallie Lake AS Aid Station | 12.2 | 4,967 ft |
Pinheads AS Aid Station | 22.4 | 4,669 ft |
Warm Springs AS Aid Station | 29.6 | 3,875 ft |
Red Wolf AS Aid Station | 35.1 | 4,209 ft |
Clackamas AS Aid Station | 40.4 | 3,356 ft |
Little Crater Lake AS Aid Station | 46.5 | 3,238 ft |
Frog Lake AS Aid Station | 54.6 | 3,930 ft |
Little Crater Lake AS Aid Station | 62.7 | 3,238 ft |
Dam AS Aid Station | 67.7 | 3,248 ft |
Clackamas AS Aid Station | 71.7 | 3,356 ft |
Red Wolf AS Aid Station | 77.0 | 4,209 ft |
Warm Springs AS Aid Station | 82.5 | 3,875 ft |
Pinheads AS Aid Station | 89.7 | 4,669 ft |
Olallie Meadows AS Aid Station | 97.7 | 4,472 ft |
Finish Finish | 101.0 | 4,961 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
Olallie Lake Resort has rustic cabins, yurts, and campgrounds (Paul Dennis and Olallie Meadows campgrounds are first-come, first-served; no car camping in parking lots). Additional campgrounds around Timothy Lake — reserve via recreation.gov. Government Camp (~20 miles) and Detroit Lake area offer lodging options.
Nighttime temps in the Oregon Cascades can drop to the low 30s°F (0°C) in September. Pack warm layers for the overnight sections.
September is generally stable in the Northwest, but mountain conditions can change quickly. Check forecasts for Olallie Lake and Timothy Lake before leaving cell coverage.
No required gear specified
No recommended gear specified
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