As the interest of fat bikes is continuously on the rise, so are the races that use fat bikes as a vehicle. Over the years, race organizers have planned unimaginable routes for winter ultras. These routes will test the abilities of even the most hardcore athletes. Winter ultra endurance events span to years back in the 80’s with the first ever Iditabike. Since then, these races and rides have become a staple in the adventure cycling community. We’re here to give you the run down on 11 winter ultra races that you should know about. Many of these events you must apply for in advance, and/or have qualified for by finishing another winter ultra. There also is an extensive required gear list for most of the events. Some items include a 0 degree sleeping bag, certain amount of calories, reflective fabrics, and blinkies for your safety. To put it simply, these races are not for the faint of heart. Here is a story that gives you an idea of how difficult this race really is. Registration is closed for this year. here. This race begins on February 21st this year and registration closes February 10th. Jeff Oatley crushing the record. The race will start on March 1st at 2pm. Registration is now closed with 37 bikers scheduled to line up in Nome. If you want to be considered for the ITI 350 mile version, you must finish one of the Iditarod Trail Invitational qualifying races.