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RMRR Fall Marathon Training Series #2

Thornton, Colorado · Sunday, September 13, 2026 · 20K, 30K

Official race page & registration ↗

RMRR Fall Marathon Training Series #2 takes place on Sunday, September 13, 2026 in Thornton, Colorado. The race offers 2 distances: 20K, 30K. For anyone travelling in, Denver is about 10 miles away.

It is one of 155 races on the Colorado calendar that September. The 20K is rare in Colorado: only four races on the calendar offer it. At $20, entry sits below the $30 median for a Colorado half marathon.

Date
Sunday, September 13, 2026
Location
Thornton, Colorado
Distances
20K, 30K
Entry fee
from $20

Listing from the 2026 race calendar, refreshed nightly. Details can change: confirm date and entry on the official race page before travelling. Spot an error? Tell us here.

Making a race weekend of it?

Stay near the start line in Thornton: check in Sep 12, out Sep 14.

Hotels on Booking.com ↗ Hotels on Expedia ↗

Common questions

When is RMRR Fall Marathon Training Series #2?

RMRR Fall Marathon Training Series #2 is scheduled for Sunday, September 13, 2026.

Where is RMRR Fall Marathon Training Series #2 held?

RMRR Fall Marathon Training Series #2 is held in Thornton, Colorado. It is about 10 miles from Denver.

What distances does RMRR Fall Marathon Training Series #2 offer?

The listed distances are 20K, 30K.

How much does RMRR Fall Marathon Training Series #2 cost?

Entry is listed from $20. Check the official race page for the current price, which usually rises closer to race day.

How do I register for RMRR Fall Marathon Training Series #2?

Registration is handled on the official race page, linked at the top of this listing. Entry can close early if the race sells out.

More races nearby

See every race on the Colorado calendar, Colorado Half Marathons, or use the Race Finder for maps and filters.