Spring - Mud Mountain Dam Marathon & Half Marathon
- Date
- May 30, 2026
- Distance
- Spring - Dam Marathon · Spring - Dam Half Marathon
From the Organizer
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.
Distances & Pricing
Race Location
About This Sport
From Endurance Grid's Founder
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
The half marathon is the distance where you find out what you're actually made of. Long enough to demand real preparation. Short enough that it doesn't consume your life to train for it. Most people who run their first half describe it as the race that changed their relationship with what they're capable of. Once you cross this finish line, the bar moves. That's not a warning — that's the point.
Race day energy varies by event size, but the finish line feeling is the same regardless. Big races keep the noise going the whole way. Smaller races give you stretches where it's just you and the miles — and that solitude becomes its own kind of fuel.
The half marathon rewards people who show up for the boring training miles.
How long to train: 10–14 weeks. If you're already running consistently, 10 weeks of structured buildup is enough. If you're building from a casual base, give yourself 14.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
More running races in WA
Frequently Asked Questions (FAQs)
- What is the Spring - Mud Mountain Dam Marathon & Half Marathon?
- Spring - Mud Mountain Dam Marathon & Half Marathon is a running event held in Enumclaw, WA. Learn more about the different endurance sports here.
- When and where is the Spring - Mud Mountain Dam Marathon & Half Marathon?
- Saturday, May 30, 2026 in Enumclaw, WA at 30525 SE Mud Mountain Rd, Enumclaw, WA. Check the official event page for exact start times and wave schedules.
- How do I register for the Spring - Mud Mountain Dam Marathon & Half Marathon?
- Registration is handled through their official registration page. Confirm pricing, distances available, and sign up there.
Spring - Mud Mountain Dam Marathon & Half Marathon
May 30, 2026