This course consists of a flat and fast 3.1 mile loop through a wetland nature preserve; 50k participants to complete 10 laps, and 25k participants to complete 5 laps within an 8 hour time cutoff for the event. Run past tidal marsh through maritime forest on a partial dirt trail and partial pavement sidewalk. We recommend choosing shoes appropriate for varied trail surface. Course is wide enough in all places for 2-3 runners abreast, providing for easy passing of other participants. Runners will go over three bridge crossings, and at no time will the tidal creek water cover the trail. Running this course will give racers plenty of opportunity to spot gators, turtles, waterfowl, and other marsh nature.

Upcoming Races

Jun 25 2022
50 KM
3.1 Mile loop
Single Loop Course
1 Elevation Rating
Flat or nearly flat
1 Surface Rating
Paved or very smooth surface


Date Finishers Top Result (M) Top Result (F)
06/13/20 Race Cancelled
06/15/19 16 4:48:58 4:40:40
06/23/18 16 5:02:53 5:06:11
06/24/17 10 4:54:02 6:38:42
06/18/16 26 4:04:38 4:31:06
We try to keep the most accurate information about this race, but changes do happen. Always visit the official race website for the most up to date information. If you see an error, please let us know

Earth Day 50K

  • Apr 16, 2022
  • Crystal Lake, IL
50 KM