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Half Marathons Found In Washington in September

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Half Marathons in Washington in September 2025

Find A Race is the US's favourite event listings site. Check out our list of September 2025 Half Marathons in Washington below.

Race Calendar: Half Marathons Found In September

🚀Boosted

Fidalgo Trail Run

Anacortes, Washington
27 Sep 25
Free - $110.73
🚀Boosted

Mud Mountain Dam Half Marathon / 5K

Buckley, Washington
20 Sep 25
$61.35 - $130.90
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Medal Madness 5K, 10K, & Half Marathon at Heritage Park, Olympia, WA (37) 30

Olympia, Washington
13 Sep 25
$33.80 - $70.90

Skagit Flats Marathon, Half & 5k

Burlington, Washington
14 Sep 25
$43.40 - $112.30

Orca Half Marathon

Seattle, Washington
20 Sep 25 - 21 Sep 25
Free - $199.29

Mud Mountain Dam Half Marathon / 5K

Buckley, Washington
20 Sep 25
$61.35 - $130.90

Anacortes Half Marathon & 5k

Anacortes, Washington
20 Sep 25
$28.56 - $56.12

Medal Madness 5K, 10K, 15K, & Half Marathon at Lowell Riverfront Park, Everett, WA (38) 80

Everett, Washington
20 Sep 25
$33.80 - $70.90

RUN THE DAM 2025

Grand Coulee, Washington
20 Sep 25
$32.80 - $69.90

Quilcene Oyster Races

Quilcene, Washington
21 Sep 25
Free - $64.60

Bellingham Bay Marathon

Bellingham, Washington
21 Sep 25
$56.40 - $316.00

National Singles Day: Singles & Friends Running Club SEATTLE

Seattle, Washington
27 Sep 25
$32.80 - $52.94

National Coffee Day: Run for Coffee SEATTLE

Seattle, Washington
27 Sep 25
$32.80 - $52.94

Fidalgo Trail Run

Anacortes, Washington
27 Sep 25
Free - $110.73

Colbert Autumn Classic Half Marathon & 4-Mile Loop

Colbert, Washington
27 Sep 25
$32.80 - $54.00

Medal Madness 5K, 10K, & Half Marathon at Liberty Park, Spokane, WA (39) 60

Spokane, Washington
27 Sep 25
$33.80 - $70.90
Showing 1-14 of 14 results

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