2021 - Rmrr Fall Marathon Training Series
2021 distances
Running
Members-RMRR Marathon Training -Fall 2021 3 race bundle (10 m, 10k or 20k, 10 m)
This signup is for the complete 3-race series of races. Nice discount and great price for three races! The races start at Riverdale Ballfields in Thornton.
Members-RMRR Marathon Training - Fall 2021 3 Race Bundle - ( 20 m, 30 k, 20 m)
This signup is for the complete 3-race Fall series of long distance races. Nice discount and great price for three races! If your training schedule tells you to run a shorter distance like 15 or 18 miles, that's fine - sign up for the 20 and just tell us how far you plan to run. Let us know on race day so we know how to time you! The races start at Rivedale Ballfields in Thornton.
Members-RMRR Marathon Training - Fall 2021 Race #1 Sunday August 29th - 10 Mile
This signup is for the single 10M race on Sunday Augsut 29th. These races start at Riverdale Ballfields in Thornton.
Members-RMRR Marathon Training - Fall 2021 Race #1 Sunday August 29th - 20 Mile
This signup is for the single 20 Mile race on Sunday August 29th. These races start at Riverdale Ballfields in Thornton. If your training schedule tells you to run a shorter distance like 15 or 18 miles, that's fine - sign up for the 20 and just tell us how far you plan to run. Let us know on race day so we know how to time you!
Non Members-RMRR Marathon Training -Fall 2021 3 race bundle (10 m, 10k or 20k, 10 m)
Non Members-RMRR Marathon Training - Fall 2021 3 Race Bundle - ( 20 m, 30 k, 20 m)
Non Members-RMRR Marathon Training - Fall 2021 Race #1 Sunday August 29th - 10 Mile
Members-RMRR Marathon Training - Fall 2021 Race #1 Sunday August 29th - 20 Mile
Members-RMRR Marathon Training - Fall 2021 Race #2 Sunday Sept. 12th - 20 k
This signup is for the single race on Sunday September 12th. These races start at Riverdale Ballfields in Thornton.
Non Members-RMRR Marathon Training - Fall 2021 Race #2 Sunday Sept. 12th - 20 k
Non Members-RMRR Marathon Training -Fall 2021 Race #2 Sunday Sept. 12th - 30 k
Members-RMRR Marathon Training - Fall 2021 Race #3 Sunday Sept. 26th - 10 Mile
This signup is for the single 10 Mile race on Sunday September 26th. This race starts at Riverdale Ballfields in Thornton.
Members-RMRR Marathon Training - Fall 2021 Race #3 Sunday Sept. 26th - 20 Mile
This signup is for the single 20M race on Sunday September 22. Remember that this race starts at Riverdale Ballfields in Thornton. If your training schedule tells you to run a shorter distance like 15 or 18 miles, that's fine - sign up for the 20 and just tell us how far you plan to run. Let us know on race day so we know how to time you!
Members-RMRR Marathon Training -Fall 2021 Race #2 Sunday Sept. 12th - 30 k
Non Members-RMRR Marathon Training - Fall 2021 Race #3 Sunday Sept. 26th - 10 Mile
Members-RMRR Marathon Training - Fall 2021 Race #3 Sunday Sept. 26th - 20 Mile
Race-day weather
Conditions on August 29, 2021 — historical Open-Meteo data.
The sun rises at 6:25 AM and sets at 7:35 PM local time (MDT) in Thornton on August 29, 2021 — 13h 10m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Other races near Thornton
Different organizers, within 40 miles, in the next three months
Rmrr Fall Marathon Training Series #2
Rmrr Fall Marathon Training Series #3
I Can 5k
I Ain't Scared (of 5k)
🏃 Plan Your Next Race in Thornton
Find upcoming events by distance:
- Thornton 5K Races 7 races
- Thornton Running Calendar 2026 12 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 12 Thornton events
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