Upcoming 100Ks

Endurance Grid lists forty-nine 100Ks across the US, from August 2026 to September 2027 across 21 states.

49
Races
21
States

The distance

What a 100K is

A 100K is a running race where athletes run 62.1 miles long (100 kilometers) for time.

100Ks are busiest in October and June, with the most in Texas, Connecticut, Pennsylvania, and Colorado.

Frequently Asked Questions (FAQs)

How many 100K running races are there in the US?+
Endurance Grid's Race Calendar lists 49 upcoming 100K running races across 21 states.
How far is a 100K running?+
A 100K is a running race where athletes run 62.1 miles long (100 kilometers) for time.
Which states have the most 100K running races?+
The states with the most 100K running races on Endurance Grid's Race Calendar are Texas, Connecticut, Pennsylvania, Colorado, Indiana, and Michigan.