Spring - Mud Mountain Dam Marathon & Half Marathon
Updated
Saturday, May 29, 2027, first start 7:00 AM, in Enumclaw (30525 SE Mud Mountain Rd). Distances: Half marathon, Marathon. Entry from $105 to $115; the Marathon goes from $115 to $125 after January 1.
- Date
- Saturday, May 29, 2027
- Start time
- 7:00 AM (earliest wave)
- Location
- 30525 SE Mud Mountain Rd, Enumclaw, WA 98022
- Area
- Eastside & South King, Seattle
- Distances
- Half marathonMarathon
- Course
- Road or path
- Price
- $105 to $115 plus the platform's processing fee
- Next price increase
- Friday, January 1, 2027: Marathon $115 → $125
- Registration
- Open. Opened October 15, online signup closes Saturday, May 29, 2027
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details. Sign up by January 1 to pay $115 instead of $125.
Register on RunSignup →Race website
Course and race notes
Start Planning Now for Your Next Boston Qualifier! Take on a beautiful, fully paved downhill course with no tunnel, no dirt, and no BQ downhill penalty. Full Marathon. The Marathon starts at Mud Mountain Dam, high above the Carbon River at an elevation of approximately 1,400 feet.
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.