Registration for August 11-13, 2023

Registration will open January 5, 2023 on Ultra Signup. Registration is first come, first served.  

We do not accept race day registrations. When an event is filled, it will be indicated on the Ultra Signup Register pop-up menu for that distance, and a waitlist option will open.  Invitations for runners on the wait list will be sent out if spots become available.

Registration includes a high-quality race shirt (size guaranteed if you register before May 1, 2023). 


Registration Fees

  • 120 mile -$345 USD Early Bird, $375 USD after March 5, 2023
  • 100 k (formerly 70 mile) -$250 USD Early Bird, $280 USD after March 5, 2023
  • 50 mile -$160 USD Early Bird, $180 USD after March 5, 2023
  • 40 mile -$145 USD Early Bird, $165 USD after March 5, 2023

Registration Site

  • Register on Ultra Signup Jan 5, 2023.

  • Deadline July 1, at midnight.

  • Deadline for submission of proof of trail work or volunteer hours (or trail work donation) is August 1, 2023

Additional items to Purchase

A selection of additional items will be available in the Ultra Signup Store.  After you register, click the STORE button to add additional items.
ultrasignup.com/shopping.aspx

Deferral Policy

Subject to availability, you can drop down to a shorter distance (no refund given). Please understand that it is a risk to pre-register for a race. Personal injuries, family emergencies, and unpredictable changes do happen and we do not offer refunds or transfer of your entry to another runner.

If you must withdraw from the race, you have two options available to you.  If you are able to volunteer with us for race weekend, a full credit of race fees paid will be applied to next year's event (minus Ultra Signup fees, which are non transferable).  You must notify Fat Dog 120 by August 1 to qualify for 100% volunteer credit.  If you are unable to volunteer for the race, you may qualify for a 50% credit of entry feed paid  (minus Ultra Signup fees which are not transferable) applied to next year's event. You must notify Fat Dog 120 before June 1, 2023 in order to qualify for a 50% credit.  Transfers can only be used for the following year's event.

Merchandise must be picked up at the event in the year it was purchased. You may give written permission for another person to pick up for you.  We do not mail merchandise or swag. If you don't pick it up you forfeit the merchandise/swag.  No deferral of merchandise is available.

Exceptions will not be made. Thank you for understanding.

Race Cancellation Policy

Fat Dog 120 reserves the right to cancel an event based on any "Act of God" including but not limited to: extreme snow pack, extreme weather before or during the event, extreme fire danger or fires near or on the course (including poor air quality), COVID-19 Pandemic or other public health emergencies, lack of permits due to an "Act of God" or other exceptional circumstances, or any other unforeseen circumstances.

In the event of a race cancellation, race entries will not be refunded. If cancelled more than 2 months before the event, a partial credit will be offered for the following year.  If the event is cancelled less than 2 months before the event, transfers may not be offered.  Mid-race cancellations will not be eligible for race credit, transfer or refund due to the high cost of organizing this event.  We will do our best to offer some type of modified race experience based on conditions and circumstances.