F^3 Cap Sauers Trail Marathon & 10 Mile

About the race

Explore the Cap Sauers Holding Nature Preserve - the largest tract of undeveloped land in Cook County, IL. This race will cover every inch of maintained trail within the Nature Preserve. With over 1000 ft of elevation, this marathon is mountainous by Chicago standards! The course uses the Sag Valley Trail system, covering the Yellow, Green, Blue & Tan trails. The whole course is wide horsetrail, allowing for 2-way traffic and encouragement from fellow participants.  Results here:  https://sites.chronotrack.com/event/92163/results 2026 Photos here:  https://www.flashframe.io/search/2861/ 2025 Photos here:  https://www.highfivebb.com/Running/F3-Cap-Sauers-Trail-Marathon-10-Mile-May-10-2025

Race information supplied by the organizer through RunSignUp.

Events & distances

• Trail Marathon

  26.2 Miles

  $101.95 including processing fees

  Saturday, May 8, 2027
  View registration

• 10 Mile

  10 Miles

  $80.75 including processing fees

  Saturday, May 8, 2027
  View registration