Spring - Mud Mountain Dam Marathon & Half Marathon Logo

Spring - Mud Mountain Dam Marathon & Half Marathon

Sat, May 29, 2027
In 197 days
Enumclaw, WA
30525 SE Mud Mountain Rd

On this date: rain 4 of the last 10 years

2026

42–52°F

rain

2025

43–57°F

rain

2024

38–46°F

rain

2023

45–62°F

dry

2022

38–43°F

rain

2021

36–63°F

dry

2020

55–70°F

dry

2019

47–62°F

dry

2018

40–50°F

dry

2017

51–74°F

dry

Best months to race in Washington →

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About this race

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 there, runners will follow a fully paved downhill route through picturesque farmland and forest, tracing the scenic Carbon River before finishing at the McMillin Farm Collective at approximately 128 feet.

That's a net elevation loss of about 1,200 feet—a fast, scenic course built for a memorable Boston Qualifier!

Half Marathon
The Half Marathon starts in the scenic town of South Prairie at approximately 467 feet and follows a gradual downhill route along the paved Foothills Rail Trail.

Runners will wind through farmland and forest alongside the Carbon River before finishing at the McMillin Farm Collective, at approximately 128 feet.

The course features a net elevation loss of 339 feet.

A Finish Line Worth Celebrating!
We've got a brand-new finish line just down the road from the McMillin Bridge, and we're making it a destination!

After crossing the finish line, stick around and celebrate with:

Brewhouse
Food trucks
Hot & Cold plunge pools

It's going to be a finish line to remember!

Beautiful course. Fast downhill miles. Fully paved. No tunnel. No dirt. No BQ penalty.

There’s no excuse not to do the dam thing!

Course map

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