Upcoming 50Ks

Endurance Grid lists seventy-six 50Ks across the US, from September 2026 to November 2027 across 26 states.

76
Races
26
States

What a 50K is

A 50K is a running race where athletes run 31.1 miles long (50 kilometers) for time.

50Ks are busiest in October and November, with the most in Colorado, Florida, South Carolina, and Pennsylvania.

Frequently Asked Questions

How many 50K ultramarathons are there in the US?
Endurance Grid's Race Calendar lists 76 upcoming 50K ultramarathons across 26 states.
How far is a 50K ultramarathon?
A 50K is a running race where athletes run 31.1 miles long (50 kilometers) for time.
Which states have the most 50K ultramarathons?
The states with the most 50K ultramarathons on Endurance Grid's Race Calendar are Colorado, Florida, South Carolina, Pennsylvania, Texas, and California.