On the World Famous Birkie Trail in Cable, Wisconsin!

The 45NRTH Fat Bike Birkie, Presented by Freewheel Bike, is the premier on snow bike event in North America. Riders test their skill and endurance on the professionally groomed American Birkebeiner Ski Trail!

Two days of fun! Friday, March 8 – Check out the Fat Bike Birkie EXPO and Fat Bike Demos!  March 9 – Race day and a Post-Race Party in the Great Hall!

2018 Fat Bike Birkie Photo Gallery »

Check out the 2019 Participant Shirt … register now to ensure you get yours!
2019 Fat Bike Birkie Participant Shirt

Fat Bike Birkie is an Open-Class Bike Race

There are no restrictions on the specific tire size allowed. 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 condition, on a bike equipped with at least 3.5 inch wide tires.

No special equipment classes will be recognized in the Fat Bike Birkie results or awards

Tempur-Pedic = 2 Free Entries! Click for Info

Event/Distance Options

47K “Big Fat” Fat Bike Race


21K “Chico” Fat Bike Race 

10K “Tour” Fat Bike Ride **NEW in 2019!

Fat Bike Birkie Start


Age Restrictions

All 47K participants must be at least 18 years of age on race day. All 21K and 10K participants must be at least 13 years of age on race day.

 May 1 to September 6September 7 to November 1November 2 to January 31After January 31
47 km or 21 km Race$65$75$85$95
10 km Tour$65$65$65$75

Race/Event Change Request

The deadline for requesting a change in race/event distances is Wednesday, February 27, 2019 at 4:00pm CST.  Request a race/event change HERE.

Protect Your Registration!

Get reimbursed up to 100% on your Fat Bike Birkie registration if you can’t compete for a number of reasons including:

  • A covered illness or injury
  • Pregnancy
  • You have a traffic accident en route to your event
  • Your car breaks down within 24 hours of the event
  • One of the many other covered reasons

Event Registration Protector also comes with Competition Care: a 24 hour assistance hotline that can give you race-day information, locate bicycle repair shops, find nearby equipment stores, and much, much more.

Add Registration Protection!

Schedule of Events

Two Full Days of Fat Bike Birkie at the Birkie Trailhead in Cable!


Courses Open for Pre-Riding10:00 AM – 3:00 PM
Expo / Bib Pick-Up / Bike Demos / Birkie Store 10:00 AM – 7:00 PM


Bib Pick Up - In the Great Hall7:30 AM to 8:30 AM
47 km Fat Bike Birkie - The Big Fat 9:00 AM
21 km Fat Bike Birkie - The Chico 9:15 AM
10 km Fat Bike Birkie - Tour9:30 AM
Expo / Bib Pick-Up / Bike Demos / Birkie Store / Brats + Beer!All Day
Post-Race Party for All Participants--Food! Plus your first beer is Free!
Spectators and families can purchase meal tickets, too!
11:00 AM to 3:00 PM
Stay tuned for more fun!

Fat Bike Expo & Bib Pick Up

fbb-demoAvoid the race morning rush and pick up your bib at the Fat Bike Expo located in the Great Hall at the Birkie Trailhead. Open from 10:00 am to 7:00 pm on Friday, March 9.

  • Fat Bike Birkie EXPO — Great Gear and Guidance from FBB Sponsors
  • Fat Bike Demos All Day
  • The Birkie Store, with Great Birkie Merchandise
  • See CAMBA Raffle Prizes / Silent Auction Items from Fat Bike Birkie Sponsors
  • Free Coffee from Hayward Coffee Company

Race Day Bib Pick up available on Saturday from 7:30 to 8:30 am.

Course Information

Both races and the Tour will start and finish at the American Birkebeiner Trailhead in Cable, WI.

Interactive Course Map

Experience the race again or for the first time! Roll over the epic hills on the legendary Birkie Trail, witness the race rollout, ride along with the pace cameras, check out the 21K and 47K courses, and feel the rush as you virtually ride the Fat Bike Birkie. This interactive map experience has it all!

Register for the Fat Bike Birkie and make it real! Because…once the race is closed…it’s closed. Don’t miss out!

View Interactive Course Map »

Fat Bike Birkie Course Timetable

 Big Fat Aid StationsDistance from the Start (K)Cut-Off Time
Timber Trail Southbound710:00
Fire Tower Southbound1210:30
Boedecker Southbound16.511:00
Boedecker Northbound26.512:15
Fire Tower Northbound3212:45
Timber Trail Northbound38.51:40
21K Aid StationDistance from the Start (K)Cut-Off Time
Timber Trail 710:00

Pre-Riding the Course — When & Where

The Fat Bike Birkie Race Courses will be groomed and marked for pre-riding on Friday, March 8 from 10:00 am to 3:00 pm.

Please note that riding bikes on the Birkie Trail during the winter is only allowed on the days designated for the Fat Bike Birkie event. However, winter bike riding can be accessed from many of the trailheads utilizing the Chequamegon Area Mountain Bike Association trail system. Trail conditions can be found on the CAMBA Winter FAT BIKE page.

Start Gates

The Big Fat (47K) race will feature 4 start gates.  Riders will be placed in one of these gates based on their best finish time from the previous 3 Big Fat or Chico (21K) races.  See the Gate Seeding Criteria tables below.  Riders without a result in the past 3 Big Fat or Chico races will be assigned to Gate 4.

Big Fat Gate Assignments based on BIG FAT results

Big Fat Gate2018 Big Fat Finish Time2017 Big Fat Finish Time2016 Big Fat Finish Time
Gate 11:48:11 to 2:04:252:05:09 to 2:23:551:46:56 to 2:02:58
Gate 22:04:26 to 2:29:182:23:56 to 2:52:422:02:59 to 2:27:34
Gate 32:29:18 to 3:03:552:52:43 to 3:32:452:27:35 to 3:01:47
Gate 43:03:56 +3:32:46 +3:01:48 +

Big Fat Gate Assignments based on CHICO results

Big Fat Gate2018 Chico Finish Time2017 Chico Finish Time2016 Chico Finish Time
Gate 1Achieved with Big Fat results onlyAchieved with Big Fat results onlyAchieved with Big Fat results only
Gate 255:48 to 1:04:1055:58 to 1:04:2254:44 to 1:02:57
Gate 31:04:11 to 1:17:001:04:23 to 1:17:141:02:58 to 1:15:32
Gate 41:17:01 +1:17:15 +1:15:33 +

Gate Upgrade Requests

Requests for gate upgrade based on other fat bike or mountain bike races can be made HERE.  There is a $10 fee required to process these requests.  To be used as a qualifying race, the race must meet certain criteria based on strength of competition, distance, and course elevation profile, determined by the Event Director.

Elite riders without previous Fat Bike Birkie results who are requesting Gate 1, send request and credentials to elite@birkie.com

There are no gate assignments for the Chico race or the Tour.


fbb-podiumFat Bike Birkie Overall Trophies will be presented to the first three male & female finishers of both races.

Cash Prizes for the first three men & women in the “Big Fat”  $500 | $250 | $100

Winners must be present at award ceremony to receive the cash prize.

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 – 18-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+
  • Chico – 13-17, 18-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+

Post-Race Parties

  • Starting at 11:00 am, riders are treated to a free post-race party with great food, Birkie Brewski Ale, or soda. Spectators can eat for just $5.
  • And stick around for the After Party on Saturday from 4:00 – 8:00 at the Sawmill Saloon in Seeley hosted by CAMBA!  This event is a fundraiser for CAMBA FAT BIKE and will include their raffle prize drawings and silent auction from Fat Bike Birkie sponsors and more. It’s a party you don’t want to miss! Check out all the details Here.

Birkie Gear Bag

2019 Birkie Gear Bags Are Sold Out!

  • If you ordered a Birkie Gear Bag, it will be waiting for you at the Fat Bike Birkie bib pick-up 2019!
  • The reusable Birkie gear bag is yours to use on your year-round adventures as well as during future Fat Bike Birkie races!
  • Dimensions: 26.5 x 10.5 x 12.5 with backpack straps.


Title Sponsor

Presenting Sponsor

Terrene Tires


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


Please contact us with any questions at birkie@birkie.com or 715-634-5025