Runners will face a temperature rise from 39°F at the start to 56°F by the finish, with humidity at 81% and a dew point of 41°F. Winds will be light from the WSW at 6 mph, not impacting performance. Runners should consider adjusting their pace as temperatures increase and stay hydrated throughout.

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Distance: 26.2mi

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Race Info

The Snohomish River Run Marathon offers a flat, fast course along the scenic Snohomish River, ideal for runners aiming for personal bests. Starting and finishing in downtown Snohomish, participants enjoy picturesque views of the river and surrounding landscapes. The event fosters a welcoming atmosphere, with all participants receiving a race shirt and finisher medal, and marathon finishers also receiving a finisher crewneck.

Website

Race weekend

Sunday, October 11

7:30 AMMarathon (26.2 mi)

8:00 AMHalf Marathon (13.1 mi)

9:00 AM10K (6.2 mi)

9:30 AM5K (3.1 mi)

Course Map

FAQ

When is the 2026 Snohomish River Run Marathon?

The 2026 Snohomish River Run Marathon will be held on Sunday October 11, 2026.

Is the Snohomish River Run Marathon a Boston Marathon Qualifier?

Yes, the Snohomish River Run Marathon is an official Boston Marathon qualifier.

What is the time limit for the Snohomish River Run Marathon?

The time limit for the Snohomish River Run Marathon is 5 hours.

What will the weather be like for the 2026 Snohomish River Run Marathon?

The forecast calls for a high of 59°F and a low of 40°F with a 0% chance of rain.

Historical Weather

Based on 15 years of data

Avg Temp

52°F

L:49° H:55°

RunScore

Conditions

Rain Freq

20%

3 of 15 yrs

Wind5mph

Dew45°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Snohomish River Run Marathon Clear conditions throughout the day. 2026	41°/50°	-	41°
2025 Snohomish River Run Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2025	49°/51°	-	45°
2024 Snohomish River Run Marathon Clear conditions throughout the day. 2024	52°/63°	-	49°
2023 Snohomish River Run Marathon Partly cloudy throughout the day with rain. 2023	57°/64°	-	50°
2022 Snohomish River Run Marathon Clear conditions throughout the day. 2022	59°/75°	-	39°
2021 Snohomish River Run Marathon Partly cloudy throughout the day with late afternoon rain. 2021	53°/55°	-	48°
2020 Snohomish River Run Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2020	50°/55°	Light	50°
2019 Snohomish River Run Marathon Partly cloudy throughout the day with early morning rain. 2019	49°/51°	-	47°
2018 Snohomish River Run Marathon Clear conditions throughout the day. 2018	40°/55°	-	36°
2017 Snohomish River Run Marathon Clear conditions throughout the day. 2017	41°/52°	-	41°
2016 Snohomish River Run Marathon Partly cloudy throughout the day with rain. 2016	48°/50°	-	45°
2015 Snohomish River Run Marathon Partly cloudy throughout the day with early morning rain. 2015	51°/58°	-	48°
2014 Snohomish River Run Marathon Partly cloudy throughout the day with rain. 2014	48°/50°	-	44°
2013 Snohomish River Run Marathon Partly cloudy throughout the day with rain in the morning and afternoon. 2013	46°/47°	Light	44°
2012 Snohomish River Run Marathon Partly cloudy throughout the day with rain. 2012	51°/56°	Light	50°