Butte 100 MTB Race 2027
- Date
- Saturday, July 17, 2027
- Start time
- 6:00 AM start (Denver)
- Location
- Butte, Montana
- Entry fee
- From $100 · goes up to $200 on Dec 10, 2026
- Included with entry
- Includes a shirt
- Fundraising
- Takes optional donations when you register
Check registration status on RunSignup.
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Events and entry fees
| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| Butte 100 | Mountain Bike | Jul 17, 20276:00 AM | $100$200 after Dec 10, 2026 | 100 |
| Tandem 100 | Mountain BikeRelay or team | Jul 17, 20276:00 AM | $100$200 after Dec 10, 2026 | – |
| Butte 50 | Mountain Bike | Jul 17, 20277:00 AM | $135$175 after Dec 10, 2026 | 200 |
| Tandem 50 | Mountain BikeRelay or team | Jul 17, 20277:00 AM | $135$175 after Dec 10, 2026 | – |
| Sorini 25 | Mountain Bike | Jul 17, 20279:00 AM | $100$150 after Dec 10, 2026 | 200 |
| Tandem 25 | Mountain BikeRelay or team | Jul 17, 20279:00 AM | $100$150 after Dec 10, 2026 | – |
Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.
Race day planning
Entry fee schedule
- Butte 100: $100 until Dec 10, then $200 until Jul 17.
- Tandem 100: $100 until Dec 10, then $200 until Jul 16.
- Butte 50: $135 until Dec 10, then $175 until Jul 17.
- Tandem 50: $135 until Dec 10, then $175 until Jul 16.
Online registration closes Jul 17, 2027, unless the race fills first.
Light and altitude
Sunrise on race morning is at about 5:54 AM, and the Butte 100 starts at 6:00 AM.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
Start location and course
Homestake Pass, Butte, MT 59701
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
2026 results
All results (6 years)Butte 50
Sorini 25
Butte 100
Aggregated from official results (Competitive Timing) for Butte 100 MTB Race. Individual finisher names are not stored here.
How fast do you need to be at Butte 100 MTB Race?
At the 2026 Butte 50, the fastest tenth finished in 5:43:55 or better, the top quarter in 6:25:00, and half the field in 7:25:04; the last tenth came in after 9:47:27.
At the 2026 Sorini 25, the fastest tenth finished in 2:45:51 or better, the top quarter in 3:18:39, and half the field in 3:58:01; the last tenth came in after 5:30:57.
At the 2026 Butte 100, the fastest tenth finished in 11:29:09 or better, the top quarter in 12:07:21, and half the field in 13:01:31; the last tenth came in after 14:38:59.
| Age | Women | Men |
|---|---|---|
| Under 20 | n/a | 5:43:24 |
| 20-29 | 7:46:14 | 5:16:58 |
| 30-39 | n/a | 5:26:08 |
| 40-49 | 7:18:44 | 5:31:25 |
| 50-59 | 8:29:39 | 6:07:41 |
| 60-69 | n/a | 8:42:34 |
Groups with fewer than five finishers are left out. Awards vary by race; check the race's rules.
What would my time get me?
Where a finish time would have placed in 2026.
Finishers by year
Up 18 percent since 2021.
All events combined, from official results.
Butte 100 MTB Race Mountain Bike year by year
From 2021 to 2026, the field went from 118 to 163 finishers, and the median time rose from 4:22:29 to 7:25:04.
| Year | Finishers | Median | Fastest tenth | Winner |
|---|---|---|---|---|
| 2026 | 163 (-5%) | 7:25:04 | under 5:43:55 | 4:45:44 |
| 2025 | 171 (-1%) | 4:05:32 | under 2:59:30 | 2:27:01 |
| 2024 | 172 (-18%) | 6:34:07 | under 5:23:09 | 4:20:34 |
| 2023 | 210 (+20%) | 8:05:24 | under 6:23:23 | 5:10:50 |
| 2022 | 175 (+48%) | 7:25:48 | under 5:57:37 | 4:41:11 |
| 2021 | 118 | 4:22:29 | under 3:07:07 | 2:10:20 |
From each year's official results for the Mountain Bike; virtual options are left out.
Race details
- Where
- Homestake Pass, Butte, MT 59701Map
- Course
- Road
- Results posted by the race
- Results
- Included with entry
- Bike Jersey; Dri-fit T-shirt
- Donations
- Accepted when you register
- Distances
- Mountain Bike
- Editions
- 2027 (Jul 17, 2027), 2026 (Jul 18, 2026), 2025 (Jul 19, 2025), 2024 (Jul 20, 2024), 2023 (Jul 22, 2023), 2022 (Jul 23, 2022)
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is Butte 100 MTB Race?
- Saturday, July 17, 2027, starting at 6:00 AM.
- How much does it cost?
- Entry starts at $100 before processing fees, and rises to $200 on Dec 10, 2026.
- When does registration close?
- Online registration closes Jul 17, 2027, unless the race fills first.
- Do athletes get a shirt or medal?
- Entry includes a shirt, according to the race's registration page. Check it for sizes and whether kids' races get the same.
- Can I donate to a cause when I register?
- Yes. The registration form offers an optional donation, usually for the charity or nonprofit the race supports. The race's own page names the cause.
- What distances are offered?
- Mountain Bike.
- How big is it, and how fast?
- In 2026, 163 athletes finished the Butte 50; the median finish was 7:25:04 and the winner finished in 4:45:44.
- Where does it start?
- Homestake Pass, Butte, MT 59701.
From the organizers
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.