Fall - Mud Mountain Dam Marathon & Half Marathon
USATF CertifiedSaturday, September 19, 2026
Enumclaw, Washington
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.
Course Information
USATF Certified Course
WA23029RMB · Expires 2033
Certified Course Name
Mud Mountain Half Marathon
Net Drop
+4.41
m/km
Separation
51.1%
start to finish
This course has a net uphill grade — expect a more challenging race. Point-to-point course layout.
View USATF Course Map (PDF)Race Details
Race Day
Saturday, September 19, 2026 · 9/19/2026 08:15
Start Location
30525 S.E. Mud Mountain Rd., Enumclaw, WA 98022
Course
Loop
Also Offers
Giveaway
T-Shirt
Registration
Register online — $70
Race Website
Official race information
Race Performance
2:08:00
9:46/mi pace
1:10:31
5:23/mi pace
185
56% female · 44% male
10 states
Avg age: 42
Finish Time Distribution (2025)
1:53:00
Top 25%
2:23:03
Top 75%
Historical Weather
☀
Avg High
68°F
☽
Avg Low
48°F
☂
Precip
0.1 in
🍃
Wind
7.4 mph
More races in Washington
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.
Course Information
USATF Certified Course
WA23029RMB · Expires 2033
Certified Course Name
Mud Mountain Half Marathon
Net Drop
+4.41
m/km
Separation
51.1%
start to finish
This course has a net uphill grade — expect a more challenging race. Point-to-point course layout.
View USATF Course Map (PDF)Race Details
Race Day
Saturday, September 19, 2026 · 9/19/2026 08:15
Start Location
30525 S.E. Mud Mountain Rd., Enumclaw, WA 98022
Course
Loop
Also Offers
Giveaway
T-Shirt
Registration
Register online — $70
Race Website
Official race information
Race Performance
2:08:00
9:46/mi pace
1:10:31
5:23/mi pace
185
56% female · 44% male
10 states
Avg age: 42
Finish Time Distribution (2025)
1:53:00
Top 25%
2:23:03
Top 75%