Available distances
About
Green River Marathon takes place on June 5, 2027, in Kent, Washington. Four formats are offered: a 50K (31.1 mi), the marathon (26.2 mi), a marathon relay and the half marathon (13.1 mi). The event is run by volunteers and free to enter, with a deliberately low-key atmosphere. Start times are not listed in our records.
Free, volunteer-run races are the best-kept secret in distance running: no expo, no medal, and a field of people who are there purely to run. Expect fewer aid stations than a commercial event, carry your own fluid and something to eat, and bring cash or a donation — these races survive on the goodwill of the people organising them.
Prepare for Green River Marathon with RunRun
An AI-generated training plan, adjusted every week based on your real sessions. Built around your goal, current level and race date.
- Personalized plan based on your VO2max, history and weekly availability
- Strava and Garmin sync: your sessions are analyzed and the plan adapts
- Target paces, long runs, key sessions: everything is calculated for race day
Races nearby
Other upcoming races around Kent.
K9 Candy Cane 5K Fun Run
Dec 6, 2026 · Renton, WA · 7 mi away
3.1 mi
Run for the Gnomes Half Marathon & 5K
Oct 3, 2026 · Maple Valley, WA · 9 mi away
13.1 mi · 3.1 mi
Maple Valley Turkey Trot: Thanksgiving Day 5K
Nov 26, 2026 · Maple Valley, WA · 9 mi away
3.1 mi
Let Me Run Fall 5K
Nov 14, 2026 · Seattle, WA · 12 mi away
3.1 mi
Run Scared - Seattle
Oct 25, 2026 · Seattle, WA · 12 mi away
6.2 mi · 3.1 mi · 2 mi
Run of Hope Seattle
Sep 20, 2026 · Seattle, WA · 12 mi away
3.1 mi