When: Saturday December 8th, 2018 @ 8:30 AM

Where: Forest Park, Springfield, MA

Cost: The race entry fee is $30 for early registration, $35 after 11/18/18.

Sign up: Click here

Race Details

Race Details:   Ten (10) 5K loops on roads in Forest Park for a total of 50 kilometers. Course runs on Snowstorm Classic 5K Route, all pavement.

Note: You can stop after any loop, do one OR do them all.

There is a 7 hour time limit(must finish by 3:30pm). There will be one aid station (at the start and every 5K) with some limited refreshments (if you are picky, bring your own nutrition).

Participants must pay small fee to park (or walk extra 1/4 mile from Longmeadow side of park).

Runners may run as many loops as they like, and drop out at any time.

The course is most of ‘Bright Nights’ route, so road should be clean. Limited traffic and hopefully it will snow (a lot).


If you’d like to help out during the race, please reach out to us via Facebook or email (volunteers @ fatass50.com)


New site up and running…

The Cyclonaut Multisport club is very excited to take over the race organization of Seth’s Fat Ass 50K. This race is the only and oldest 50k ultra in Western Massachusetts. We look forward to putting on an amazing event and hope that you can join us.


This event is being organized by the Cyclonaut Multisport club based in Agawam, MA. If you’d like more information about the Cyclonauts please visit our website.