Riverdale Ballfields in Thornton, Thornton CO
Sunday, September 13th, 2026
Event Overview
RMRR provides full and half marathon training opportunities for runners of all abilities.
Marathon Training Series Details
- Race Options: RMRR’s Marathon Training Series provides 10mi/20km and 20mi/30km races that are low cost, friendly, supported, and officially timed.
- Focus: All you need to do is focus on your running! The MTS fits well into training schedules for Colorado Springs, Boulderthon, Long View, Chicago, Monumental (Indy), New York, and other fall full and half marathons.
- Inclusivity: Everyone is welcome to Marathon Training Series races: RMRR members, guests, training team members, everyone!
- Course Support: The courses are well marked, with mile markers to help you gauge your time. We’ll time your run, and winners of each distance will receive ribbons.
Safety Guidelines
- Pets & Strollers: Please note that for everyone's safety, dogs or running strollers are not permitted on our courses. Thanks for understanding.
Race Schedule
The races begin at 7 am at Riverdale Ballfields at 9830 Riverdale Road in Thornton Colorado.
- #1: Aug 25 - 10mi & 20mi
- #2: Sep 8 - 20k & 30k
- #3: Sep 22 - 10mi & 20mi
- Flexibility: You are welcome to run 15mi, 25k, or another distance. Just let us know at the start.
Membership Discounts
RMRR Members receive a $5 discount off individual races and $15 off the 3-race bundles. Discount taken when you check out. Your membership must be current.
More Information
For additional details, visit the race page: RMRR Fall Marathon Training Series #2.
