Mountain Lakes 100
Mountain Lakes 100 circles remote Oregon lakes and Cascade forest on a mountain course known for runnable trail and sustained nighttime miles.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 23, 2026.
Quick facts
- Saturday start on September 19, 2026
- Dedicated Oregon 100-miler
- Olallie Lake and Cascade forest
- Remote mountain trail course
2026 Mountain Lakes 100 registration
Registration for the 2026 Mountain Lakes 100 runs through the official registration page at ultrasignup.com.
About the Mountain Lakes 100
Mountain Lakes maintains a dedicated hundred-mile entry, route, crewing plan and result archive within Go Beyond Racing's portfolio.
Course
Singletrack and forest routes around Olallie Lake and Mount Hood country mix long runnable sections with substantial accumulated climbing.
Race-day weather
September may bring clear days and cold nights, while rain, wildfire smoke or early mountain snow remain meaningful risks.
Past Mountain Lakes 100 dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Saturday, September 19, 2026 | Upcoming | — |
| 2025 | — | Completed | Open results |
Mountain Lakes 100 FAQ
When is the Mountain Lakes 100?
The 2026 Mountain Lakes 100 is on Saturday, September 19, 2026.
How do I register for the Mountain Lakes 100?
Register for the Mountain Lakes 100 through the official registration link: marathonscout.com/go/mountain-lakes-100/register. It opens the race registration page at ultrasignup.com.
Send Marathon Scout an official race update
Send us confirmed dates, registration links, results, live tracking, or course changes. Every update is reviewed before it goes live.