Spring - Mud Mountain Dam Marathon & Half Marathon
About this race
May 30, 2026 – The Full Marathon Returns!
We’re excited to announce that the Full Marathon is coming back on May 30, 2026, and will also be part of our September event. Start planning now for your next Boston Qualifier on this beautiful, fully paved downhill course, no tunnel, no dirt, no BQ penalty.
There’s no excuse not to do the dam thing!
Marathon
The marathon course begins at Mud Mountain Dam (elevation 1,400′). Runners will follow a fully paved route through picturesque farmlands and forested areas, tracing the path of the Carbon River. The race finishes in front of the historic McMillin Bridge (elevation 200′), with a total net elevation loss of approximately 1,200′.
Half Marathon
The Half Marathon begins in the scenic town of South Prairie (elevation 467′) and follows a gradual downhill route along the paved Foothills Rail Trail. Runners will enjoy a picturesque journey through farmland and forest, winding alongside the Carbon River and finishing in front of the historic McMillin Bridge (elevation 128′). The course features a net elevation loss of 339 feet.
Pick your distance
Running
Spring - Dam Marathon
Spring - Dam Half Marathon
Typical race-day weather
Based on 2 years of Open-Meteo archive data for this event's race dates in Enumclaw, plus the 3 days either side.
The sun rises at 5:17 AM and sets at 8:53 PM local time (PDT) in Enumclaw on May 29, 2027 — 15h 35m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Results — Spring - Mud Mountain Dam Marathon & Half Marathon
Other races near Enumclaw
Different organizers, within 40 miles, in the next three months
Never Ending Nolte 6-Hour
Ten Trails Active Club Trot n' Treat Relay Scramble
Ten Trails Active Club 5k Turkey Trot
Gobble Gobble 5K & 10K
🏃 Plan Your Next Race in Enumclaw
Find upcoming events by distance:
- Enumclaw Half Marathons 2 races
- Marathons in Enumclaw 2 races
- Enumclaw Running Calendar 2026 5 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 5 Enumclaw events
Spotted something wrong? Tell us and we'll fix it.