Fall - Mud Mountain Dam Marathon & Half Marathon

Fall - Mud Mountain Dam Marathon & Half Marathon

Race Date

Sep 19, 2026

Location

Enumclaw, WA

The Experience

September 19, 2026 – The Full Marathon Returns! We’re excited to announce that the Full Marathon is coming back in 2026, and will also be part of our. Start planning now for your next Boston Qualifier on this beautiful, fully paved downhill course, no tunnel, no dirt, no BQ time 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.

Logistics

Race Day

Saturday, September 19, 2026

Start Time

8:15 AM

Giveaway

T-Shirt

Start Location

30525 S.E. Mud Mountain Rd., Enumclaw, WA, 98022

Directions

Course Info

USATF Certified

Course Type

Loop Course

Terrain

road

Difficulty

Ultra-Flat

Net Drop/km

+4.41 m

Separation

51.1%

Also Offers

26.2 Miles

USATF Certified Course

WA23029RMB · Expires 2033 · Mud Mountain Half Marathon

Net uphill grade — expect a more challenging race. Point-to-point course layout.

Historical Performance

Median Finish

2:08:00

9:46/mi

Winning Time

1:10:31

5:23/mi

Finishers (2025)

185

States Represented

10 / 50

Gender Split

56% Female44% Male

Finish Time Distribution

1:104:35

FASTER 25%

1:53:00

MEDIAN

2:08:00

SLOWER 25%

2:23:03

Average runner age: 42

Race Day Weather

5-year historical avg

Start (Low)

48°

Afternoon (High)

68°

Pleasant conditions — light layers at start, comfortable by finish

0.1"

Precipitation

7 mph

Wind

73%

Humidity

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