Paleozoic Trail Runs – Ordovician Spring III
Willow Springs, IL
- 50K, 25K
- Trail (Unpaved)
- Official race website
Journey back in time to this rollicking run along forested, unpaved paths of our Palos / Sag Valley Trail Systems within the Cook County Forest Preserve – Regions 6 / 7. We’ve charted a stimulating course that’s sure to satisfy your primordial instinct to “go long.” Are you up to … MORE
Local Historical Weather (Mar 21):
| 2026 | 2025 | 2024 | 2023 | 2022 | |
| H (°F) | 77 | 59 | 40 | 54 | 75 |
| L (°F) | 43 | 31 | 28 | 36 | 46 |
Find Nearby Lodging (hotel, rental, etc.):
Great introduction to trail running
This race starts in a large open field, then ushers runners to a wide dirt path, which has a few gradual hills, then becomes single-track, with a few technical patches … MORE
This race starts in a large open field, then ushers runners to a wide dirt path, which has a few gradual hills, then becomes single-track, with a few technical patches to spice things up. The way you run it makes it feel like an introduction to trail running with the terrain challenge increasing as you go along. The 25K is an out-and-back with 50K runners repeating the course. The course is inside the Chicagoland Palos Forest Reserve, whose paths are varied, though don’t absorb water very well. If it’s rained at all in the last week, expect marshy sections. The organization is great, the race fee is cheap, and the post-race spread this year included local homebrews.