Des Plaines River Trail Races

Event overview

The Des Plaines River Trail Races take place on October 11, 2025, at Half Day Forest Preserve in Lake County, Illinois. Distances offered include:

• 50 Mile
• 50 Km
• Marathon
• Half Marathon

This is the 15th edition of the event. Registration opens January 1, 2025 at 10:00 am Central. Packet pickup is available the week before the race at local locations in Libertyville and Park Ridge. The marathon distance is a Boston Qualifier. The event is cup-less; participants must bring their own cup, hydration pack, or bottle.

Course and logistics

All races run primarily on the Des Plaines River Trail, a flat, wide crushed gravel surface described as free of roots and rocks. Races are largely out-and-back along the northern segment of the trail. Major road crossings use bridges or viaducts; minor road crossings occur on longer distances. The trail can flood during heavy rain; an alternate course will be used if needed.

Aid station provisions vary by distance:

• Half Marathon: 2 manned, 2 unmanned
• Marathon: 6 manned, 2 unmanned
• 50 Km: 9 manned, 2 unmanned
• 50 Mile: 10 manned, 2 unmanned

Time limits are posted per distance (for example, Half Marathon 9.5 hours; Marathon 10.5 hours; 50K 11.5 hours; 50 Mile 11.5 hours). There are no refunds; transfers and rollovers are allowed within stated deadlines and fees. Finisher medals are awarded for every distance and prizes are given for overall and age-group placements. Visit the organization's website for the most recent information.