10 km out and back, repeated 10 times for 100K, 5 times for 50K, 3 times for 30K, 1 times for 10K.  Surface is asphalt bike path. Approx. 90% of course has dirt path next to bike path. Course will be in use by other pedestrians (esp. bicycles) and possibly equestrians on race day.  Temperatures may range from 30 degrees to 80 degrees on race day.  Average Temperatures range between 47 and 68 degrees in February.

Upcoming Races

Feb 28 2020
6 Hours
Out and Back Course
1 Elevation Rating
Flat or nearly flat
1 Surface Rating
Paved or very smooth surface
Feb 28 2020
12 Hours
Out and Back Course
1 Elevation Rating
Flat or nearly flat
1 Surface Rating
Paved or very smooth surface
Feb 28 2020
24 Hours
Out and Back Course
1 Elevation Rating
Flat or nearly flat
1 Surface Rating
Paved or very smooth surface
Feb 28 2020
50 KM
Out and Back Course
1 Elevation Rating
Flat or nearly flat
1 Surface Rating
Paved or very smooth surface
Feb 28 2020
100 KM
Out and Back Course
1 Elevation Rating
Flat or nearly flat
1 Surface Rating
Paved or very smooth surface

Results

24 Hours View course top times

Date Finishers Top Result Top Result (F)
02/16/19 6 80.78 24.85

12 Hours View course top times

Date Finishers Top Result Top Result (F)
02/16/19 3 31.07 49.71

6 Hours View course top times

Date Finishers Top Result Top Result (F)
02/16/19 No Finishers

50 KM View course top times

Date Finishers Top Result Top Result (F)
02/16/19 36 3:49:16 5:06:41
02/24/18 32 4:41:35 5:38:41
02/25/17 43 4:19:29 4:00:01
02/27/16 37 3:56:36 5:29:37
02/28/15 28 4:28:54 4:56:18
02/20/10 38 3:34:27 4:45:57
02/21/09 52 3:36:53 4:49:35
02/16/08 35 3:41:49 4:45:44
02/17/07 37 4:02:44 3:57:10
02/18/06 31 3:39:52 4:54:15

100 KM View course top times

Date Finishers Top Result Top Result (F)
02/16/19 8 8:57:01
02/24/18 14 8:46:03 10:52:14
02/25/17 8 10:34:15 10:11:44
02/27/16 10 9:38:47 10:30:32
02/28/15 6 12:16:01 10:12:59
02/20/10 18 8:12:08 10:56:55
02/21/09 29 7:46:20 11:19:20
02/16/08 23 8:29:24 9:50:16
02/17/07 6 7:53:27
02/18/06 6 10:49:33 10:24:21
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.
Earth Day 50K
  • Apr 18, 2020
  • Crystal Lake, IL
50 KM