2017 Fat Bike Birkie Photo Gallery »

On the World Famous Birkie Trail!

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

Three days of fun!  March 10 – Check out the Fat Bike Birkie EXPO and Fat Bike Demos, and ride the Criterium course!  March 11 – Race day, Post-Race Party in the Great Hall, and CAMBA After Party at the Sawmill Saloon in Seeley, WI, with Big Prize Giveaways and a Silent Auction from Fat Bike Birkie Sponsors!  March 12 – Guided singletrack ride by CAMBA and fat bike demos at the “OO” Trailhead.

Fat Bike Birkie is an Open-class Bike Race

There are no restrictions 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

Event/Distance Options

47 km (29 miles) 49K “Big Fat” Fat Bike Race

23 km (14 miles) 21K “Chico” Fat Bike Race

Friday Evening Criterium

Pre-Riding the Course — When & Where

The Fat Bike Birkie Race Courses will be groomed and marked for pre-riding on Friday, March 10 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.



Registration is now CLOSED! You can still sign up for the FBB Crit!

All long race participants must be at least 18 years of age on race day. All short race participants must be at least 13 years of age.
This event has a participant cap of 1200.

Register now for the 2017 FBB Criterium!

Get your legs warmed up on Friday with a little crit racing!

  • Kids: 10-14 years old, free!
  • Novice: 15 minutes + one lap, $10
  • Expert: 25 minutes + one lap, $10

Schedule of Events

Three Full Days of Fat Bike Birkie!


Courses Open for Pre-Riding10:00 AM – 3:00 PM
Expo / Bib Pick-Up / Bike Demos / Birkie Store / Brats + Beer!10:00 AM – 7:00 PM
Novice Criterium: 15 minutes + one lap4:30 PM
Kid’s Criterium: 5 laps – ages 10 to 145:00 PM
Expert Criterium: 25 minutes + one lap5:30 PM


Bib Pick Up - In the Great Hall7:30 AM to 8:30 AM
47 km Fat Bike Birkie - The Big Fat9:00 AM
23 K Fat Bike Birkie - The Chico9:15 AM
Post-Race Party for All Participants--Fajitas! Plus your first beer is Free!
Spectators and families can purchase meal ticket for $5.00
11:00 AM to 3:00 PM
Bike Demos / Birkie Store / Brats + Beer!All Day
After Party hosted by CAMBA at the Sawmill Saloon,
Seeley, WI. Raffle prizes and silent auction from Fat Bike
Birkie Sponsors! See more at CAMBA online and at Expo booth.
4:00 PM to 8:00 PM
Just 3 of the Big Raffle and Silent Auction Items!

Just 3 of the Big Raffle and Silent Auction Items!


Bike Demo at the Highway OO Trailhead9:00 AM - 12:00 Noon
CAMBA Guided Singletrack Rides at the Highway OO TrailheadStarts at 10:00 AM

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 10.

  • 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
  • Brats + Beer Outside by the Bike Demos and Fire Pits
  • Free Coffee from Hayward Coffee Company

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

Course Information

Course Update:

3.08.17: After repeated warm and rains this last week, the Birkie Trail that has been groomed all winter is now a HUGE sheet of ice.  The trail crew has tried all means to renovate and scarify the surface, but we just don’t feel like we can create a race course that is safe for nearly 1200 riders…SO…we have searched out an alternate course and found one!!  Ski trails adjacent to the Start/Finish venue have not been groomed all winter and are in much better shape-  a combination of of grass, snow and small icy patches that are avoidable (and we can sand!).  The race course will consist of an approx 9.4 km loop with an additional 1.8 km roll-out segment.  The short race will be 2 laps for an estimated total of 21km, the long race 5 laps for 49km.  More details and course updates coming soon.

Races will start and finish at the new American Birkebeiner Trailhead

Big Fat Course: 5 Laps of New Alternate Course

The Chico Course: 2 Laps of New Alternate Course

Aid Stations and Cut-off Times

km from Start
Cut-off Time
McNaught 1
McNaught 2
McNaught 3
McNaught 4
McNaught 5

Check out the Trail Genius coverage of the 2015 FBB below – The 2017 race will feature a slightly different course, however these videos and maps give you a good idea about the trail and terrain.

Start Gates

The “Big Fat” Fat Bike Birkie will feature 4 start gates. Riders will be placed in one of these gates based on their finish time from the long race of the 2016 Fat Bike Birkie. Riders without a previous result will be assigned to Gate 4.

There will not be any gate assignments for the shorter Chico race.


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+


Title Sponsor

Presenting Sponsor

Clif Bar
BeFAST Sportgear
Maxxis Tires
Magura USA
Bemer Group


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 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