Mountain Lakes 100

SEP
18-19
2027
A 100 mile trail race from Olallie Lake largely on the Pacific Crest Trail between Mt Jefferson and Mt Hood, with 11,700 feet of ascent and remote mountain terrain.
18-19 Sep 2027
100 miles

Always double-check with the organizer's website! This page may contain affiliate links.

About the race

Mountain Lakes 100 is a 100 mile trail race based at Olallie Lake Resort in Oregon. The routed course runs largely on the Pacific Crest Trail between Mt Jefferson and Mt Hood and passes dozens of alpine lakes and singletrack sections. The course includes technical, rocky trail and sustained mountain terrain with about 11,700 feet of total ascent and descent. The course low point is about 3,300 feet and the high point about 5,700 feet.

The event has a field capacity of 150 and includes a 30 hour time limit. All entrants and waitlisters must complete eight hours of trail work sometime after October 1 and by September 1; a signed form from the trail work site manager is required by the deadline. The race operates with manual paper tracking at aid stations and HAM radio communications; there is little or no internet or cell service along much of the course, and live tracking is not available at aid stations.

Parking at the resort is limited with designated short term, long term, and roadside options; no RVs or trailers are allowed in the long term lot. The organizer’s cancellation policy disallows transfers and refunds; cancellations more than 30 days before the race receive a 50 percent credit toward a future race, cancellations 30 days or less receive no credit. The route is on national forest land and may encounter horses on multi use trails. Visit the organization's website for the most recent information.

100 mi
100 Miler
Add Event
Help us complete the calendar!
  • Distance is at least 5 km
  • Event has a website or Facebook page
Website
Optional: Please provide your e-mail address if we may contact you.
Report a change
We will only update the data if the information is also on the website.