calendar_today 01 Oct, 2026 – 02 Oct, 2026
directions_run Running
language Official Website
sell $55.00 – $155.00
World's Best Marathon & Half Series!
No Time Limits
Great Food
Award-Winning Medals
Loony Community!
We RUN this country, TOGETHER!
Here's a link to the 2026 Center of the Nation Series page, which has additional information on each of the locations and the series as a whole.
If you're interested in any Mainly gear, check out our Merch!
Peace, love, and cheers to you all!
-Mainly Family
Oct 01, 2026
Distance — 10K
Type — Running
119 days remaining
$65.00
Oct 01, 2026
Distance — 50K
Type — Running
119 days remaining
$155.00
Oct 01, 2026
Distance — 5K
Type — Running
119 days remaining
$55.00
Oct 01, 2026
Distance — 21.1K
Type — Running
119 days remaining
$125.00
Oct 01, 2026
Distance — 42.2K
Type — Running
119 days remaining
$145.00
These values represent the 3-year monthly averages for October in Belle Fourche.
Learn more about the host city, Belle Fourche.
Belle Fourche is a city in the Badlands and Black Hills region of South Dakota. It is the closest settlement to the geographic center of all 50 states of the United States.
Read more launchRead what other athletes have to say about their experience at the 2026 Center of the Nation Series - Day 4 (SD).
Be the first to share your experience with the community!
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location_on Custer, South Dakota, US
calendar_today Sep 16, 2026
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Mar 21, 2027
WE ARE NOW OFFERING AN AQUABIKE DIVISION! Triathlon Information:Join us for the annual Space Coast Triathlon, held in …
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