Green River Marathon Race Info



Avg Temps f.


Gain/Loss in ft


Furthest Aid

3 miles

Highest Elev.






Time Limit

5:15 (Early start available)



Longest Climb

40 ft within .1 miles

Summary: A flat, point to point race from Kent to Alki, Washington, the Green River Marathon is a Marathon/Relay/Fun Run put on for free. It is put on entirely by an all volunteer crew and donations by the event’s originators and organizers. The run is free, the aid is free, shirts are sold at cost, there are no bib numbers, there are no awards, and no one is paid. The run is very flat with two short hills late in the run. The last few miles have views of Seattle and Puget Sound towards the Olympics. The finish is in front of Spud’s Fish and Chips at Alki.

Race Details

Lessons Learned from Race Reports / Important things to note

  • Everyone must carry a water bottle
  • Cupless race, so no cups provided at aid stations
  • Must start at 8:30am (normal starting time) for it to be a Boston Qualifier
  • Some of the race course isn’t the most inspiring, as it can get monotonous in the Industrial District, but it’s prettier in the beginning and end sections.
  • Pay attention to course markings and turns, especially if you’re not running in a group or around many people


Total gain/loss: ~110/127

Total climbs: 1 of 40 ft just before mile 18

Longest climb: 40 ft within .1 miles

Steepest climb: 40 ft within .1 miles

Map (See Strava activities for Elevation profile)

Aid stations

Total aid stations: 10

Furthest distance apart: 3 miles

Locations: Miles 2.5, 5.1, 7.8, 10.4, 13.1, 16, 19, 21, 22.5, 24

What’s available: Water and Gatorade at all aid stations

Crew access

Family and friends can read the course directions on the website for locations to see their runners along the way.



Race qualifiers


Race reports

Strava activities and GPX files

Race Website