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Half Marathons Found In Washington in September
View all ↓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
πBoosted
Fidalgo Trail Run
Anacortes, Washington
27 Sep 25
Free - $110.73
πBoosted
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