F^3 Cap Sauers Trail Marathon & 10 Mile

Lace up for an unforgettable trail adventure at the F^3 Cap Sauers Trail Marathon & 10 Mile, set to take place on May 9, 2026, in Palos Hills, IL. This event plunges runners into the heart of the Cap Sauers Holding Nature Preserve, the largest undeveloped tract of land in Cook County, offering a truly wild escape just outside Chicago. Participants will navigate every maintained inch of the Sag Valley Trail system, traversing wide horsetrails that promise minimal technical challenges but deliver plenty of undulating terrain.

Don't let the flat Midwest stereotype fool you; both the marathon and 10-mile courses are described as "mountainous" by local standards. The marathon boasts approximately 1050 feet of elevation gain, while the 10-mile race features a respectable 670 feet, ensuring a challenging and rewarding experience. The marathon course is uniquely structured with two circuits of the 10-mile loop, followed by an out-and-back 10k section, ensuring runners will encounter cheering support from fellow participants on the frequently two-way trails. Expect well-stocked aid stations at regular intervals, providing water, Gatorade Endurance, gels, and snacks like pickles and gummy bears, along with porta-potties.

Beyond the challenging course, the F^3 Cap Sauers Trail Marathon & 10 Mile is celebrated for its grassroots community feel and unique offerings. Finishers are awarded a distinctive wooden sunflower medal, and marathon participants also receive a finisher's shirt and a technical trucker hat. The post-race celebration includes warm vegan chili and refreshing beer, providing the perfect way to refuel and commemorate your achievement. Typical race day conditions in early May feature comfortable highs around 71°F and lows near 47°F, with a modest 21% chance of precipitation, offering pleasant weather for hitting the trails. Packet pickup is conveniently located on race day at the Teason's Woods picnic shelter, where you'll receive your uniquely hand-colored, pre-assigned bib.