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Hallucination 100
Race Details:
- Location: Gregory, MI, USA
- Race Date: 09/12/2026
- Race Distances: 100 Mile, Ultra Marathon
What This Race Counts Toward:
Western States 100: Yes
UTMB Index: No
Hallucination 100 Description
Hallucination 100, the headline event of the Run Woodstock festival, sends runners around six laps of a rugged 16.6-mile loop through the Pinckney Recreation Area’s Potawatomi Trail, one of Michigan’s most technical singletrack courses. Set at a peace-and-music-themed campground near Gregory, the race blends serious mileage with a laid-back festival vibe — camping, live music, and fellow runners sharing the same loop all weekend. As the 4th leg of the Midwest Grand Slam of Ultrarunning and a Western States qualifier, Hallucination 100 draws a groovy but seriously fit crowd chasing 100 miles within a 30-hour cutoff.
Always check the official race website for the most accurate and up-to-date race information and logistics.
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Hallucination 100 Additional Details:
Runners who fall off 100-mile pace get automatically switched to the 100K after completing four loops in under 20 hours, so the race always rewards forward progress even on a rough day. Aid stations appear every 3 to 5 miles with hot food at the main Hog Farm and Food for Love stations, plus salty snacks, gels, and Coke everywhere — just bring your own cup, since it’s a cupless race throughout. Pacers may join after the second loop, one at a time, and get a bib and weekend pass of their own. Because the course loops back through the Woodstock Camp so often, most runners skip a dedicated crew entirely and lean on the hundreds of fellow entrants and volunteer ‘Roadies’ cheering from the sidelines instead.
Course Information
Profile: Rolling Hills
Type: Multiple Loops
Surface: Trails
Pace Groups: No
Time Limit: 30 hr
# of Finishers
100 Mile: 81 finishers (2025)
Elevation Details
Elevation Gain: 9,000 ft
Elevation Loss: 9,000 ft
Average Temperature
- Low: 53°F
- High: 74°F
Train Smarter for Race Day
A great race starts long before the starting line. Whether you’re chasing your first finish or hunting a new PR, a structured training plan takes the guesswork out of race prep — building your fitness, your confidence, and your mileage at the right pace for you.
Explore plans for every distance and experience level, from your first 5K to your next ultra.
Things to Do in Gregory, MI, USA
Make the most of race weekend — here’s how to fill the time before and after you cross the finish line.
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Hotels & Lodging Near the Hallucination 100
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