Registration for the December 2017 race opens midnight central time August 1st at Ultra Signup. Each race distance will be capped at 100 entrants.

A list of registered runners will be available on Ultra Signup. Be sure to click on the appropriate link to view the correct list, i.e.,  80 Miles or 160 Miles.

Read the Rules before you register. Some of the rules have changed from previous years. There are gear requirements for both distances. If you do not have the required gear, you will not be allowed to race.

In order to register for the 160 mile, you must have completed one of the following races:

– Tuscobia 160/150/80/75 mile

– Arrowhead 135 mile

– Iditarod Trail Invitational 130/350/1000 mile

– Actif Epica

– Fat Pursuit 200 km / mile

– Frozen Otter 64 mile

– Triple D 100 km

– Susitna 100 mile

– White Mountains 100 mile

– Yukon 100/300 mile

– 6633 Arctic Ultra

– Alaska Mountain Wilderness Ski Classic

You will not be able to register for the 160-mile event if you have not completed one of the above.

Entry Fees for December 2017:

Until Sept 30:          160 mile: $150   |    80 mile: $100

Oct 1 – Dec 1:          160 mile: $200 |    80 mile: $150

Note the only price difference compared to the Jan 2017 event is the second tier 80 mile price is $150 rather than $140.

Entry will close at midnight on Dec 1, or when registration caps have been met.

No refunds. No deferrals. No number transfers.

If your mode of transport is full, DO NOT register for a different mode thinking you can switch. You cannot. We will keep a waitlist (email us at and may release spots from one mode to another or from one distance to another.