Olallie Lake, Oregon · Trail
Official site ↗Mountain Lakes 100
One of Oregon's most scenic 100s, looping from Olallie Lake through the Mount Hood National Forest past dozens of alpine lakes, with 11,700 feet of gain.
Distances
- Distance
- 100 mi (161 km)
- Vert gain
- 11,700 ft (3,600 m)
- Cutoff
- 30 hr
WSER 2027 qualifier (sub-30:00)
| Distance | Vert gain | Cutoff | Notes |
|---|---|---|---|
| 100 mi (161 km) | 11,700 ft (3,600 m) | 30 hr | WSER 2027 qualifier (sub-30:00) |
Race-day weather
The forecast for Olallie Lake, Oregon on September 19, 2026: high 73°F (23°C), low 44°F (7°C), 0% chance of precipitation.
Forecast via Open-Meteo, refreshed hourly.
About
The Mountain Lakes 100 loops from Olallie Lake Resort through the Mount Hood National Forest, running past dozens of alpine lakes with Mount Jefferson and Mount Hood in view. It climbs and drops about 11,700 feet, which by 100-mile standards is runnable, and that plus the September timing makes it a common pick for a first hundred or a fast one.
Go Beyond Racing puts it on, starting at 8:00 a.m. with a 30-hour cutoff. Entry is first come, first served rather than a lottery, capped at 150 runners, and a finish counts as a Western States 100 qualifier.
Course
A loop from Olallie Lake Resort through the Mount Hood National Forest, past dozens of lakes, with about 11,700 feet of gain and the same descent. The race starts at 8:00 a.m. and holds a 30-hour cutoff.
How to register
Registration is first come, first served on UltraSignup and is not a lottery, with tiered pricing that rises from January until it closes August 31, capped at 150 runners with a waitlist that has cleared entirely by early September in recent years. Every entrant and waitlister owes eight hours of trail work, and forfeits their place on September 2 without it.