Green River Marathon
Race Day Weather
Mild start, warming up later
Runners will face a starting temperature of 57°F, rising to 70°F by the finish. With a maximum wind of 9 mph from the WSW and average humidity at 57%, conditions are generally favorable. To ensure optimal performance, a conservative start is advised as temperatures climb, and hydration should be prioritized throughout the race.
The Green River Marathon, a volunteer-run event in Kent, WA, offers a flat and fast course with picturesque views. Runners enjoy a scenic journey along the Green River Trail, culminating in a finish with views of Seattle, Puget Sound, and the Olympic Mountains. This community-focused race emphasizes a low-key, friendly atmosphere, and historically operates with no entry fee, instead relying on donations to support Northwest Harvest. Source
FAQ
When is the 2026 Green River Marathon?
Is the Green River Marathon a Boston Marathon Qualifier?
What is the time limit for the Green River Marathon?
What will the weather be like for the 2026 Green River Marathon?
Historical Weather
Temperature History
Range of temperatures during race hours for each year.
Detailed History
| Year | Conditions | Low / High | Rain | Dew Point | Score |
|---|---|---|---|---|---|
2025 | | 62°/77° | - | 53° | |
2024 |  | 55°/62° | - | 47° | |
2023 |  | 55°/70° | - | 44° | |
2022 | | 58°/68° | - | 51° | |
2021 | | 55°/64° | - | 46° | |
2020 | | 54°/61° | - | 46° | |
2017 | | 57°/63° | - | 46° | |
2016 | | 67°/80° | - | 55° | |
2015 | | 64°/80° | - | 52° | |
2014 | | 57°/70° | - | 51° | |
2013 | | 56°/69° | - | 46° | |
2012 | | 54°/65° | Light | 49° | |
2011 | | 56°/74° | - | 50° | |
2010 | | 54°/66° | Light | 46° | |
2009 | | 57°/61° | - | 53° | |
2008 | | 49°/56° | - | 44° | |
2007 | | 62°/77° | - | 48° | |
2006 | | 57°/68° | - | 48° |