40M/50M Challenge - Deer Grove East

Take on the challenge of 40 or 50 miles at one of the Chicago area's most scenic trail-running venues. The Next Loop 40M/50M Challenge at Deer Grove East Forest Preserve is designed for runners ready to move beyond the marathon, tackle their first ultra, or set a new personal distance record.

The course features a scenic loop through mature woodlands, rolling terrain, and wide, runnable trails that provide an ideal balance of challenge and accessibility. Runners will return regularly to the centralized Start/Finish area, aid station, and personal staging areas, making nutrition, hydration, and gear changes simple throughout the day.

The loop-based format removes much of the stress associated with traditional ultra-distance races. Your crew, supplies, and support are always nearby, allowing you to focus on pacing, strategy, and reaching the finish line.

🏃 Race Options

40 Mile Challenge
50 Mile Challenge
⏱ 12-Hour Cutoff
A challenging but attainable goal for runners stepping up from the marathon or 50K distance, while still offering a meaningful test for experienced ultra runners.

✅ Fully Stocked Aid Station
✅ Personal Runner Staging Areas
✅ Crew-Friendly Format
✅ Pacers Allowed After the Halfway Point
✅ Ideal First 40-Mile or 50-Mile Ultra
✅ Beautiful Forest Preserve Trails
✅ Supportive and Encouraging Atmosphere

Whether you're attempting your first ultra-distance finish or pursuing a new personal best, Deer Grove East provides the perfect setting to challenge yourself. You'll find a community of runners who understand that success isn't measured by where you place—it's measured by your willingness to keep moving forward when the miles begin to add up.

Every ultra begins with a single step. Every finish begins with the decision to keep going.

When the day gets long and the miles get tough, will you find the strength for One More Loop?