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Butte 100 MTB Race

Sat July 20, 2024 Butte, MT 59701 US Directions


Butte 100

$260 6:00AM MDT
28 spots left. Registration ends July 18, 2024 at 11:59pm MDT

Butte 50

$190 7:00AM MDT
27 spots left. Registration ends July 18, 2024 at 11:59pm MDT

Sorini 25

$120 8:00AM MDT
Sorry! This event is full.
The Waiting List has closed. Click here to view your status. Registration ends July 19, 2024 at 11:59pm MDT









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.

Racer Info

To all Butte 100, 50, and Sorini 25 Racers:

Welcome to the 2024 Butte 100 Mountain Bike Race on July 20, 2024!  It is getting close to race day and I just wanted to pass along a few important points along with times and locations for the mandatory racers meeting and drop bag information.  Once again a tremendous amount of work has gone into this great event and I hope each of you have a wonderful and memorable time. 

Here are a few things you need to know:


Packet pick-up & mandatory racer meeting, Friday, July 19, 2024

Butte Civic Center-Annex  East Side of Building

·         Packet pick-up will be from 2pm until 7pm.  It will NOT take place during the 6pm race meeting but will resume after the meeting concludes.

·         A mandatory racers meeting will be at 6pm at the Butte Civic Center Annex

·         All racers must be present to pick up racer packet and be informed of any last minute course information, safety protocol, and drop bag delivery.


Aid Station Drop Bags

·         All racers in the Butte 100 are non-supported, wilderness races and the use of racer drop bags is strongly encouraged.  Race supplies other than water and Hammer Heed should be considered supplemental.

·         Racers are allowed one 1-gallon zip-lock bag per aid station.

·         Bags must be in the possession of the race no later than 7:00pm on Friday, July 19, to guarantee delivery to the proper aid station.

·         Markers will be provided at packet pick-up to label drop bags with your racer number.  Other recognizable designing/labeling is encouraged to help aid station organizations and efficiency.


Cut-off Time/DNF

To facilitate racer safety and search and rescue personnel utilization the following cut-off times will be strictly enforced.  If a racer is not through the designated location before the assigned cut-off time, that racer will not be allowed to continue the race and will be transported back to the start/finish area.

·         Aid station #6 100 mile racers only – 1:00pm

·         Aid Station #10 all racers – 7:00pm

·         Racers that drop must either arrange a ride back to the start/finish area or patiently wait until drop shuttle arrives.  Only full or near-full car loads will be transported back to the start/finish area.

·         Every dropped racer must notify race volunteer/timing booth at the finish line immediately upon arrival and return their timing chips.

·         Failure to check-in at the timing booth could result in wasted efforts by Search and Rescue teams and volunteers and result in the guilty racer being sent a bill from the Search and Rescue organizations.


Additional Race Policies

·         Note: Mechanical support is the responsibility of the racer.  No outside individuals including family or team members are allowed to help the individual racer in any way once the race begins.

·         E-bikes are not allowed.

·         Racers must complete the race on the same bike.

·         Drop handlebars and/or cross-bikes are not permitted.

·         All racers must compete and follow the rules in the race of which they are registered.  Failure to do so will result in a DQ.

·         Dogs are strongly discouraged around the start/finish area and on the actual race course.  Any dog in the area must be on a leash for its safety as well as the safety of the racers and other spectators.  PLEASE LEAVE YOUR DOG AT HOME.


The 2024 race bible will be on this site prior to the race.  Please like our Butte 100 Mountain Bike Races Facebook page too for additional information.   Remember to download the Butte 100 App.  Please let your family members know as well so they track you during the race. 

If you haven’t made your hotel reservations, please do so at our host hotels, Clarion Copper King Hotel and Convention Center (406) 565-5001 or Comfort Inn of Butte at (406) 494-8850.  If you are looking for additional information on Butte, please check out

We look forward to meeting each of you and working with you to make this race better each year. 


Best of luck,


Stephanie Sorini

Race Owner 

(406) 490-7632

Race Contact Info

If you have any questions about this race, click the button below.



Homestake Pass
Butte, MT US 59701

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