Illini 600K takes place on Fri, Aug 28, 2026 in Oswego, United States. The main route is 609 km.
- Date
- Fri, Aug 28, 2026
- Start
- Oswego 🇺🇸
- Distance
- 609 km
- Level
- Open to all
The Illini 600K is a flat and remote 609 km ACP brevet organized by Chicago Randonneurs, starting and finishing in Oswego, Illinois.
Official event pageWhat this race demands
The Illini 600K demands severe multi-day endurance to cover a remote 609 km distance as an ACP brevet.
Extreme Distance
Covering 609 km requires sustained aerobic output and meticulous pacing over a continuous effort spanning multiple days.
Self-Sufficiency
The remote nature of the route demands complete independence in managing nutrition, mechanical issues, and fatigue.
Consume 60 to 90 grams of carbohydrates per hour to sustain energy levels across an event lasting well over twenty hours.
What would it take you?
Pick the level closest to yours for an estimate of finish time on this course and the training a solid preparation needs.
Estimated finish
19:00–22:50
Peak-week training
6–8 h/week
A model estimate from distance, climbing and level, not a promise. Conditions, drafting and pacing move it.
IntervalCoach turns those weekly hours into a concrete plan built around your actual fitness. Start with this race as your goal
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