On the World Famous Birkie Trail in Cable, Wisconsin!

Fat Bike Birkie is an Open-Class Bike Race

The Birkie groomers are some of the best in the world and have the goal of providing a firm surface to ride on for the races. However, we cannot control the weather and the course conditions can vary widely, from hard packed to soft powder. Just like in the Birkie Ski race, Fat Bike Birkie participants are free to choose different equipment based on the conditions of the course. We recommend that participants be prepared to race in any course conditions.  Bikes should equipped with at least 3.5 inch wide tires, suitable to course conditions.

E-bikes are not allowed for any event of the Fat Bike Birkie.

No special equipment classes will be recognized in the Fat Bike Birkie results or awards.  Tandems bikes are allowed, but there is not a special class and will not be eligible for awards.  Each tandem rider must register and contact registration@birkie.com to ensure the proper results are shown.

Event/Distance Options

The Big Fat 47K Race

The Half Fat 16K Race 

The Fun Fat 10K Tour


2025 Fat Bike Birkie Registration is Open!

June 10 through August 29August 30 through November 7November 8 through January 30January 31 through March 7 or until full
Big Fat, Half Fat or Fun Fat $80$90$100$110

Registration closes on Friday, March 7, 2025 at 7:00pm CST.

All Big Fat 47K participants must be at least 16 years of age on race day. All Half Fat 21K and Fun Fat 10K participants must be at least 12 years of age on race day.

Register early to guarantee your Fat Bike Birkie t-shirt!Race/Event Change Request

The deadline for requesting a change in race/event distances is Friday, March 7, 2025 at 7:00pm CST.

  • To change your race event/technique (ALL EVENTS):
    • Log in to your RunSignUp Profile HERE
    • Scroll down to your event and click on “Manage Registration”
    • Click on “Transfer Event” (along both top and bottom menus).
    • Then select which new race you want to transfer to and complete new registration. You will be charged any differences and/or associated fees in the final cart.  There is a $25 change fee.

2025 Birkie Gear Bag

As part of our ongoing Birkie Green initiative, we’ve partnered with SWIX on the Birkie gear bag!  The reusable Birkie gear bag is available for $70 and only during registration for the Birkie, Korte, Prince Haakon and Fat Bike Birkie.

  • During the 2025 registration process, you can claim your own bag for only $70!  The $145 value Birkie gear bag is available during the registration process only.
  • Quantities limited! Register for the race and gear bag soon to guarantee a Birkie gear bag!
  • Birkie gear bags will be distributed as part of bib pick-up.
  • To add-on a Birkie Gear Bag (subject to availability):
    • Login to your RunSignUp profile.
    • Scroll down to your event and click ‘Manage Registration’
    • Click ‘Add Ons’ (along either top or bottom menu)
    • Change your “Birkie Gear Bag” selection

Birkie Gear Bag Features

The Birkie gear bag has large, heavier zippers and plastic clips throughout the bag.

  • Reinforced #10 zippers
  • Tarpaulin panel on the bottom section for waterproofing and greater durability
  • Bottom wet-sealed compartment for Nordic Boot storage (fits up to size 13 Nordic boot)
  • Fleeced lined Sports Shield zipped compartment for glasses or visor, with brushed lining to prevent lens scratches and quick, easy access
  • Large top-load zippered compartment for warm-up clothing, extra hats, and gloves
  • Two zippered side compartments for extra water bottles and accessories
  • Inside secured pocket for valuables; mobile phone, keys and wallet pocket
  • Main pack body is made from tough 600D PVC backed polyester, internal frame-sheet transfers weight evenly and contours to the wearer’s back
  • Padded EVA foam back offers cushioning and breathability over pressure points, and padded shoulder straps and harness system to distribute weight evenly

Getting to the Venue

Driving to the American Birkebeiner Trailhead – Start & Finish Venue

All races start and finish at the American Birkebeiner Trailhead, Cable, Wisconsin.  Access to the start area is available ONLY from Telemark Road.  GPS Coordinates: 46.193613, -91.256976

  • From Cable, WI, Take Highway M traveling East out of Cable for 2-miles. Turn right on Telemark Road.  Follow the road past the former Telemark Lodge to the designated parking areas.  Follow the directions of the parking attendants.



The awards ceremony will take place at the podium outside of the Dersken Family Great Hall. Overall awards for the Half Fat will begin at 9:30 am. Age Group awards for both races and Overall Awards for the Big Fat will begin at 12:00 pm.

Fat Bike Birkie Overall Trophies will be presented to the first three male & female finishers of the Big Fat and Half Fat races. The top three winners will also receive a custom race vest from Borah Teamwear.

Age Class Awards will be given to the 1st, 2nd and 3rd place riders, male and female, in

each age class for the Fat Bike Races.

  • Big Fat – 16-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+
  • Half Fat – 12-17, 18-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+


Official Bicycle of the Birkie


Supporting Sponsors of the Fat Bike Birkie

Onyx Racing Products

Gold Circle Elite
Gold Level Sponsors of the Major Birkie Events Year-Round

Kwik Trip
Tamarack Health
Republic Services
Backroads Coffee
Earth Rider Brewery
Timber Ford

Be Part of the Birkie and the Markets We Serve!

Andrew Manocheo
Partnership Director
American Birkebeiner® Ski Foundation


Want to get involved, see this event up close and personal, and be part of what makes Birkie events great?  Contact the Birkie at 715-634-5025 x:2 or click HERE for available shifts. There is no obligation — we’re happy to answer your questions. Contact us today!

Race Policies

ABSF Participant Rules