RunRace USA › Massachusetts › Seth's Fat Ass 50K
Seth's Fat Ass 50K
Springfield, Massachusetts · Saturday, December 12, 2026 · 50K
Official race page & registration ↗Seth's Fat Ass 50K takes place on Saturday, December 12, 2026 in Springfield, Massachusetts. The race is run over 50K. For anyone travelling in, Worcester is about 41 miles away.
It is one of 27 races on the Massachusetts calendar that December. The 50K is rare in Massachusetts: only two races on the calendar offer it.
- Date
- Saturday, December 12, 2026
- Location
- Springfield, Massachusetts
- Distances
- 50K
Listing from the 2026 race calendar, refreshed nightly. Details can change: confirm date and entry on the official race page before travelling. Spot an error? Tell us here.
Making a race weekend of it?
Stay near the start line in Springfield: check in Dec 11, out Dec 13.
Common questions
When is Seth's Fat Ass 50K?
Seth's Fat Ass 50K is scheduled for Saturday, December 12, 2026.
Where is Seth's Fat Ass 50K held?
Seth's Fat Ass 50K is held in Springfield, Massachusetts. It is about 41 miles from Worcester.
What distances does Seth's Fat Ass 50K offer?
The listed distances are 50K.
How do I register for Seth's Fat Ass 50K?
Registration is handled on the official race page, linked at the top of this listing. Entry can close early if the race sells out.
More races nearby
- Dec 12P.R.I.D.E. Inc 9th Annual Running of the Elves 5KTaunton, MA
- Dec 12South Boston Catholic Academy Jingle Bell Run 2026Boston, MA
- Dec 12The Mount Hood Nutcracker ChallengeMelrose, MA
- Dec 12Winter SOLEstice 5K Run/WalkWilmington, MA
- Dec 13Bill Rodgers Somerville Jingle Bell Run & WalkSomerville, MA
See every race on the Massachusetts calendar, Massachusetts Ultras, or use the Race Finder for maps and filters.