Rmrr Fall Marathon Training Series

RMRR provides full and half marathon training opportunities for runners of all abilities.

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, Boulderthon, Long View, Berlin, Chicago, Monumental (Indy), New York, and other fall full and half marathons.

Everyone is welcome to Marathon Training Series races: RMRR members, guests, training team members, everyone!  The courses are well marked, with mile markers will help you gauge your time.  We’ll time your run, and winners of each distance will receive ribbons.  We make it easy for you to work on your pace, your nutrition and drinking, and getting everything ready for your big race.

Please note that for everyone's safety dogs or running strollers are not permitted on our courses.  Thanks for understanding.

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
You are welcome to run 15mi, 25k, or another distance. Just let us know at the start.

RMRR Members receive a 25% discount. Discount taken when you check out. Your membership must be current.

Join fellow runners on August 24, 2025 for the Rmrr Fall Marathon Training Series. It's a fantastic 16.1K, 32.2K featuring a flat and fast course in Thornton.