Race Discovery
RMRR September Trophy Series
RMRR September Trophy Series logo

RMRR September Trophy Series

Thornton, Colorado, United States View on map
Sep 13, 2026 (America/Denver local time)
Running

About this race

Rocky Mountain Road Runners holds a monthly Trophy Series in the Denver area.  We provide a low-key, low-cost racing environment. Everyone is welcome to run with us!

The 10km race uses a handicap start system, slow-to-fast, spread over ~30 minutes. This gives everyone a chance to win. We'll use your estimated finish time to assign you a start time with others the same speed.

All 5k racers will start ~15min after the first 10km starters.

Race Day Details

Time: 10k starts at 8:00 am + your handicap.*
           5k starts approximately 15min after the first 10k starter.
Show up 30 minutes early to get your tag and warm up.
Location: Riverdale Ballfields, 9830 Riverdale Road, Thornton, Colorado, 80229
Course:  Both distances are out-and-back on a mix of paved and smooth gravel.  
Parking:  Plenty of parking at the park.

* The Trophy Series races use a unique, handicap start and scoring system. 10k racers start from slow to fast giving everyone a chance to win. When you register and pick up your number, we'll help you choose an appropriate start time that fits your estimated time.

Pick your distance

Running

10k

Sep 13, 2026 10K 8:00 AM
$15.00
Closed

5k

Sep 13, 2026 5K 8:15 AM
$15.00
Closed

Typical race-day weather

Based on 7 years of Open-Meteo archive data for this event's race dates in Thornton, plus the 3 days either side.

Temp (°C)
Minimum temperature (race-week average) 13.0° / Maximum temperature (race-week average) 28.7°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) 12.6° / Maximum feels like — heat index / wind chill (race-week average) 28.8°
Peak wind (km/h)
Strongest wind of the day (race-week average)
18.0
Precip (mm)
Precipitation over the day (race-week average)
0.8mm
Humidity
Mean relative humidity (race-week average)
42.4%
Sunrise
Sunrise at the start line on September 13, 2026 (MDT)
Sunset
Sunset at the start line on September 13, 2026 (MDT)
Daylight
Hours between sunrise and sunset on race day
12h 32m

The sun rises at 6:39 AM and sets at 7:12 PM local time (MDT) in Thornton on September 13, 2026 — 12h 32m of daylight.

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

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Other races near Thornton

Different organizers, within 40 miles, in the next three months

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 13 Thornton events

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