calendar_today 29 Sep, 2026 – 30 Sep, 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
Sep 29, 2026
Distance — 10K
Type — Running
71 days remaining
$65.00
Sep 29, 2026
Distance — 50K
Type — Running
71 days remaining
$155.00
Sep 29, 2026
Distance — 5K
Type — Running
71 days remaining
$55.00
Sep 29, 2026
Distance — 21.1K
Type — Running
71 days remaining
$125.00
Sep 29, 2026
Distance — 42.2K
Type — Running
71 days remaining
$145.00
These values represent the 3-year monthly averages for September in Sterling.
Learn more about the host city, Sterling.
Sterling is in the Eastern Plains of Colorado.
Read more launchRead what other athletes have to say about their experience at the 2026 Center of the Nation Series - Day 2 (CO).
Be the first to share your experience with the community!
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