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Race-Day:

July 25th, 2015 6:00 AM (100 mile), 8:00 AM (50 mile), Homestake Pass parking area.

2015 Registration Fees:

100 Mile Racer Registration Fees

  • $200.00 (upon successful lottery draw)

50 Mile Racer Registration Fees

  • $150.00 (upon successful lottery draw)


Race Policy:  50% of entry fee will be refunded if you cancel before July 13th, 2015.  For a detailed race policy, click here

Important Links:

Butte100 website

Butte 100 Facebook Page

Butte 100


2015 Butte 100-Mile $200.00
Lottery winners will be notified via email the first week of March and provided an Access Code to complete the registration.
Access code required!
Available Until : Sunday, July 12, 2015 11:59 PM
Registration List / Roster

2015 Butte 50-Mile $150.00
Lottery winners will be notified via email the first week of March and provided an Access Code to complete the registration.
Access code required!
Available Until : Sunday, July 12, 2015 11:59 PM
Registration List / Roster

2015 Butte 25-Mile $60.00
New distance for 2015! Registration fee does not include jersey - Jerseys available for purchase at a discount.
Available Until : Sunday, July 12, 2015 11:59 PM
Limited Availability : 34 Remaining
Registration List / Roster

2015 Butte 100 Waitlist $0.00
Registration List / Roster

2015 Butte 50 Waitlist $0.00
Registration List / Roster

Lottery Registration - New for 2015

Entrance to the 2015 Butte 100 is now lottery-based. Cost is $5 to enter the lottery, which will be open from January 1, 2015 to February 28, 2015.  Winners will be notified via email the first week of March and provided an Access Code to complete the registration. Winners will have one-week to complete registration. If registration is not completed in one week’s time, the registration is automatically forfeited and will be offered to the waiting list. Any proceeds remaining from the lottery will be donated between the Mariah’s Challenge scholarship foundation and local trail building/maintenance efforts. 

The Butte 100 is an ultra endurance mountain bike race that takes place in southwest Montana over some of the best single-track trails around!

Combined total racer cap: 350 (100 Mile = 125, 50 Mile = 125, 25 Mile - 100)

Cancellation Policy

A 50 and 100 mile wait list will be avaialable once registration is full.  If you cancel before July 14th, 2014, 50% of your entry fee will be refunded and your spot will be filled from the first available wait-list spot.  Transfers are not allowed.

100 Mile Course

The 100 mile course will consist of a North Loop (first 50 miles) and a South Loop (second 50 miles). There will be 10 intermediate aid stations at approximately 10 mile intervals (including the start/finish area). For a complete detailed description, click here.  

50 Mile Course 

The 50 mile course will consist only of the South Loop. There will be 4 intermediate aid stations at approximately 10 mile intervals. For a complete detailed description, click here.  

If you have any questions, look us up at http://butte100.com/crew/

When & Where
Event Date:
Saturday, July 25, 2015  
Event Location:
Homestake Pass
Butte MT 59701

Exact Location
Location Map