100 Mile (40 hour limit) and 100K (26 hour limit), 150 entrant limit (100 for 100M, 50 for 100K unless 100M doesn't fill), on a sortafull moon weekend (85-91% waning gibbous, for those tracking). Staggered start based on anticipated finish time - e.g., if you need 40 hours, you'll start first on Friday afternoon; if you only need 30 hours, you'll start approximately ten hours later; with the objective that all runners finish within a calculated four hour window before 10:00 AM Sunday. Thus, your time under one or two full moons will depend on your anticipated speed, and your risk of DNF'ing is somewhat comparable across the whole field, not just the "back of the pack"ers - when you miss the A/S cutoff, you're done... We have one year's worth of lab rat data, so we won't be quite so generous in padding hours in your favor.

Results

100 KM View course top times

Date Finishers Top Result Top Result (F)
03/05/10 8 17:14:00 20:33:00
03/13/09 39 11:20:00 14:07:00
03/21/08 41 12:23:00 13:09:00

100 Miles View course top times

Date Finishers Top Result Top Result (F)
03/05/10 23 21:02:00 29:06:00
03/13/09 42 21:31:00 25:27:00
03/21/08 43 17:24:00 25:23:00
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