Held annually in the wooded trails of Gregory, Michigan, Run Woodstock blends endurance racing with a music-festival vibe and takes place at Hell Creek Ranch, typically in early September. Runners can choose from a massive range of events, including 5K, 10K, Half Marathon, Marathon, 50K, 50-mile, 100K, and 100-mile options—plus unique challenges like back-to-back marathons and multi-day camping experiences. The scenic courses include dirt paths, rolling hills, and dense forest trails that challenge ultrarunners and energize newcomers alike. Post-race, participants enjoy live music, bonfires, yoga sessions, and other 1960s-themed festivities. It’s one of the most distinctive running weekends in the U.S., known for its inclusive spirit and countercultural joy.
Races
100 miles
100 km
50 miles
50 km
Marathon
Half Marathon
5 miles
Race Date:
05 September, 2025
Also starting at 2:00 PM on September 5, the Hallucination 100 Mile ultra runs six loops of the woodland trail system in Gregory, organized by RF Events. With approximately 5,000 ft (~1,524 m) of ascent per loop, runners face a monumental multi-loop mountain trail challenge.
Weather based on historical averages.
FAQs
What is the Hallucination 100 Mile?
How long is the Hallucination 100 Mile?
Where does the Hallucination 100 Mile take place?
What is the elevation gain of the Hallucination 100 Mile?
How can I prepare for the Hallucination 100 Mile?
How do I choose the right training plan for the Hallucination 100 Mile?
Also starting at 2:00 PM on September 5, the Hallucination 100 Mile ultra runs six loops of the woodland trail system in Gregory, organized by RF Events. With approximately 5,000 ft (~1,524 m) of ascent per loop, runners face a monumental multi-loop mountain trail challenge.
The Hallucination 100 Mile is 161km long.
The Hallucination 100 Mile takes place in Gregory, MI, USA.
The Hallucination 100 Mile elevation gain is 2750 metres, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hallucination 100 Mile?
Also starting at 2:00 PM on September 5, the Hallucination 100 Mile ultra runs six loops of the woodland trail system in Gregory, organized by RF Events. With approximately 5,000 ft (~1,524 m) of ascent per loop, runners face a monumental multi-loop mountain trail challenge.
How long is the Hallucination 100 Mile?
The Hallucination 100 Mile is 161km long.
Where does the Hallucination 100 Mile take place?
The Hallucination 100 Mile takes place in Gregory, MI, USA.
What is the elevation gain of the Hallucination 100 Mile?
The Hallucination 100 Mile elevation gain is 2750 metres, which Runna classifies as a Moderate race.
How can I prepare for the Hallucination 100 Mile?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hallucination 100 Mile?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
More
Sport:
Running
Tags:
Major City
Nature
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Run Woodstock Gregory 2025 or RF Events. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Run Woodstock Gregory 2025 website.
