Mountain Lakes 100

About the race

Mountain Lakes 100 is a 100-mile trail race in Oregon that runs mostly on the Pacific Crest Trail between Mt. Hood and Mt. Jefferson, passing many alpine lakes and single-track sections. The course includes technical and rocky trail, with a low point around 3,300 feet and a high point near 5,700 feet, and totals about 11,700 ft of elevation gain and loss. The race starts and finishes at Olallie Lake Resort and has a 30-hour time limit. Capacity is limited to 150 entries.

Organizers require all entrants and waitlisters to complete eight hours of trail work between October 1 and the following September 1; the signed trail-work form must be submitted before the deadline, and entrants without completed trail work forfeit their spot on September 2. The published registration fees are $385 for the early window and $395 for the later window; these amounts do not include Ultrasignup processing fees, taxes, or add-ons. There are no transfers and no refunds; cancellations more than 30 days before the race receive a 50% credit toward a future Go Beyond Racing event, while cancellations 30 days or less before the race receive no credit.

Aid-station tracking is manual using paper records and HAM radio; there is very limited cell or internet coverage on course and at the start area. Parking at Olallie Lake Resort is limited and organized into short-term, long-term (small lot, $20 cash), and designated road parking on the northbound side only. Weather in September is typically cool and clear by day with nights that can drop to the 30s, but mountain conditions can be unpredictable. Horses may be encountered on multi-use trails. Visit the organization's website for the most recent information.

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