Riverdale Ballfields in Thornton, Thornton CO
Sunday, August 23rd, 2026
Event Overview
RMRR provides full and half marathon training opportunities for runners of all abilities.
Marathon Training Series Details
RMRR’s Marathon Training Series provides 10mi/20km and 20mi/30km races that are low cost, friendly, supported, and officially timed. All you need to do is focus on your running! The MTS fits well into training schedules for:
- Colorado Springs: A great starting point for training.
- Boulderthon: Prepare effectively for this challenge.
- Berlin, Chicago: Join the journey to these iconic marathons.
- Monumental (Indy), New York: Get ready to conquer the fall races.
Welcoming All Runners
Everyone is welcome to Marathon Training Series races: RMRR members, guests, training team members, everyone!
- Course Management: The courses are well marked, with mile markers to help you gauge your time.
- Timing: We’ll time your run, and winners of each distance will receive ribbons.
- Preparation: We make it easy for you to work on your pace, nutrition, and drinking.
- Support: Get everything ready for your big race!
Important Safety Note
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 24 - 10mi & 20mi
- #2: Sep 7 - 20k & 30k
- #3: Sep 21 - 10mi & 20mi
- Note: You are welcome to run 15mi, 25k, or another distance. Just let us know at the start.
Member Discounts
RMRR Members receive a 25% discount, taken when you check out. Your membership must be current.
More Information
For more details and to register, visit the RMRR Fall Marathon Training Series page.
