Butte 100 MTB Race
About this race
Welcome to the most difficult mountain bike race in the country: The Butte 100. The Butte 100 race weekend consists of three individual races, a 100 mile, 50 mile and the Sorini 25, taking place atop the Continental Divide just outside of Butte, Montana. The race has grown from a small group of dedicated locals on a gravel road, to world-class athletes competing on world-class trails. With outstanding partnerships with the USFS, BLM, community of Butte, our generous sponsors, and the “neon army” of volunteers, the Butte 100 races continue to provide the best mountain bike racing experience possible. Thanks for visiting.
Please visit our Facebook page for updates and announcements.
Pick your distance
Mountain biking
Butte 100
Butte 50
Sorini 25
Tandem 100
Tandem 50
Tandem 25
Typical race-day weather
Based on 13 years of Open-Meteo archive data for this event's race dates in Butte, plus the 3 days either side.
The sun rises at 5:56 AM and sets at 9:16 PM local time (MDT) in Butte on July 17, 2027 — 15h 20m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Results — Butte 100 MTB Race
Other races near Butte
Different organizers, within 40 miles, in the next three months
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 6 Butte events
Spotted something wrong? Tell us and we'll fix it.