Riverdale Ballfields in Thornton, Thornton CO
Sunday, September 27th, 2026
Event Overview
RMRRs Marathon Training Series (MTS) races are low cost, friendly, supported, accurately measured, well marked, and timed. Each MTS has 10mi & 20mi, or 20k & 30k options. All you need to do is focus on your running!
Training Compatibility
The MTS fits well into training schedules for:
- Colorado Springs: Ideal for local runners
- Boulderthon: Get ready for this scenic marathon
- Long View: Perfect for long-distance training
- Chicago, Monumental (Indy), New York: Prep for various fall full and half marathons
Race Details
MTS#3 offers 10mi & 20mi options (we can accommodate almost any distance in between).
- Date: September 27, 2026
- Location: Riverdale Ballfields at 9830 Riverdale Road in Thornton, Colorado
- Start Time: Races begin at 7 am
- Series Options: #1: Aug 25 - 10mi & 20mi: #2: Sep 8 - 20k & 30k: #3: Sep 22 - 10mi & 20mi
Safety Information
Please note that for everyone's safety, dogs or running strollers are not permitted on our courses. Thanks for understanding.
Discounts for Members
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 more details and registration, visit the official race page: RMRR Fall Marathon Training Series #3.
