RMRR Spring Marathon Training Series #2
Sat, Apr 11, 2026, 8:00 AM MDT
- Location
- Thornton, CO
- 88th and Colorado, 80229
- Type
- RUN
Sign up and verify details on the organizer’s official page.
At a glance
A fully supported, low-cost 20-mile training run designed to help you prepare for your spring marathon or half marathon.
- Competitive
CompetitiveGreat for: runners who like a competitive edge
Less ideal for: walkers-only pacing
Prepare for your spring marathon or half marathon with the RMRR Spring Marathon Training Series. This second event in the series offers a 20-mile distance, providing a crucial long run opportunity. Designed for runners of all abilities, the event is low cost, fully supported, and officially timed. Focus on your running with clearly marked courses, mile markers, and well-stocked aid stations. It's a welcoming environment for RMRR members, guests, and training team members alike, perfect for those targeting races like Boston or London.
What to expect
- An officially timed 20-mile course, ideal for marathon training.
- Clearly marked routes with mile markers to help you gauge your pace.
- Aid stations offering water, sports drink, and gels for sustained support.
Standout details
- Officially timed event
- Aid stations with water, sports drink, gels
- Ribbons and gift certificates for winners
- Low cost entry (RMRR members get 50% off)
Auto-drafted from the public listing — confirm details on the official event page before signing up.
Distances & registration
2 optionsRegistration for all distances is through the official signup link above.
- 10 Miles
Sat, Apr 11, 8:00 AM MDT · From $22.20
Opens Dec 22, 2025, 10:00 AM MST · Closes Apr 10, 2026, 1:00 PM MDT
- 20 Miles
Sat, Apr 11, 8:00 AM MDT · From $32.80
Opens Dec 22, 2025, 10:00 AM MST · Closes Apr 10, 2026, 1:00 PM MDT
Vibe Check
Push Potential
Push Potentialaltitude
- High altitude
Based on terrain, weather, and distance data.
The course
- Hilly
- Timed race
From the organizer
RMRR provides consistent and individualized marathon training opportunities for runners of all abilities.
All races in the series are low cost, friendly, fully supported, and officially timed.The first two races, March 29 & April 11, are 10 Mile and 20 Mile races (runners choice for distance). The third race in the series is the Inaugural Blue Heron half marathon. All you need to do is focus on your running! Our races fit perfectly in training schedules for Boston, London, Colfax, and other spring full and half marathons.
Everyone is welcome to Marathon Training Series races: RMRR members, guests, training team members, everyone! The course is clearly marked, and mile markers will help you gauge your time. Aid stations will have water, sports drink, and gels. Winners of each distance will receive ribbons and running store gift certificates. We make it easy for you to work on your pace, your nutrition and drinking, and getting everything ready for your big race.
RMRR members get a 50% discount (automatically taken at registration check out). Race day registration will be available.
Please note that for everyone's safety dogs or running strollers are not permitted on our courses. Thanks for understanding.
The races begin at 8 am at the Platte River Trailhead Park in Thornton, at 88th and Colorado.
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