In 27 days · Sat, Sep 19, 2026
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When
Saturday, September 19th, 2026
Where
30525 S.E. Mud Mountain Rd., Enumclaw WA
Distances
Marathon · Half
Typical weather
46–61°F · some rain risk
See last 10 years
On this date: rain 4 of the last 10 years
2025
49–68°F
dry
2024
45–60°F
dry
2023
44–57°F
dry
2022
49–67°F
dry
2021
45–53°F
rain
2020
51–60°F
rain
2019
43–57°F
dry
2018
42–58°F
dry
2017
41–48°F
rain
2016
43–55°F
rain
Best months to race in Washington →
About this race
Event Overview
- Date: September 19, 2026
- Location: 30525 S.E. Mud Mountain Rd., Enumclaw, WA
- Race URL: Fall Mud Mountain Dam Marathon & Half Marathon
- Notable Feature: Full Marathon Returns!
Marathon Details
- Course Start: Begins at Mud Mountain Dam (elevation 1,400′)
- Route: Fully paved through picturesque farmlands and forested areas
- Finish Line: Historic McMillin Bridge (elevation 200′)
- Elevation Loss: Total net elevation loss of approximately 1,200′
Half Marathon Details
- Course Start: Begins in the scenic town of South Prairie (elevation 467′)
- Route: Gradual downhill along the paved Foothills Rail Trail
- Scenery: Journey through farmland and forest, winding alongside the Carbon River
- Finish Line: Historic McMillin Bridge (elevation 128′), with a net elevation loss of 339 feet
Encouragement to Participate
- Motto: There’s no excuse not to do the dam thing!
- Goal: Start planning now for your next Boston Qualifier
- Course Benefits: Fully paved downhill course, no tunnel, no dirt, no BQ time penalty!
- Excitement: We’re excited to announce the return of the Full Marathon!
Course map
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