River Trail 2026

The River Trail races take place on the Des Plaines River Trail in Lake County, Illinois, offering half marathon, marathon, 50K, and 50-mile distances. Races are held on the second weekend of October, beginning and ending at Half Day Forest Preserve. This marks the 14th year for the event, and the marathon distance is a Boston qualifying race. The course is a flat, wide crushed-gravel path through forest preserves, alternating between wooded areas and open wetlands. The path is clear of roots and rocks, providing a smooth surface similar to a rail-trail. Bridges and viaducts cross major roads, with the half marathon having no road crossings, the marathon two, and the 50K and 50-mile courses four. The cool fall weather, mild terrain, and clear path make it suitable for runners aiming for a personal best, particularly those seeking an ultra distance without significant climbs or difficult footing.