calendar_today 01 Oct, 2026 – 02 Oct, 2026
directions_run Running
language Official Website
sell $65.00 – $175.00
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
27 days remaining
$75.00
Oct 01, 2026
Distance — 50K
Type — Running
27 days remaining
$175.00
Oct 01, 2026
Distance — 5K
Type — Running
27 days remaining
$65.00
Oct 01, 2026
Distance — 21.1K
Type — Running
27 days remaining
$145.00
Oct 01, 2026
Distance — 42.2K
Type — Running
27 days remaining
$165.00
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 and the county seat of Butte County, South Dakota, United States. The population was 5,617 at the 2020 census, and was estimated to be 5,855 in 2024, making it the 18th-most populous city in South Dakota. It is near the geographic center of the United States, which moved some 550 miles northwest from the geographic center of the contiguous United States in Lebanon, Kansas with the admission of Alaska and Hawaii in the mid-20th century.
Read more launchRead what other athletes have to say about their experience at the 2026 Center of the Nation Series - Day 4 (SD).
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