RMRR September 5k/10k
RMRR September 5k/10k is a running race on September 13, 2026 in Thornton, CO, with an entry fee of $10.
- Date
- September 13, 2026 (52 days to go)
- Price
- $10
- Sport
- Running
From the Organizer
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.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
83°
Typical Low
50°
Chance of Rain
20%
Based on US Climate Normals data from Northglenn, 5 mi from the venue.
Host City
About Thornton, CO
Population
142,878
as of 2023
City Elevation
5,347 ft
Nearest Airport
DEN
Denver International Airport · 16 mi
Time Zone
Mountain Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at RMRR September 5k/10k, put it on the calendar, and turn “someday” into a start date.
52
Days to train
- Race
- RMRR September 5k/10k
- Date
- September 13, 2026
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From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
More Running races near Thornton, CO
Summer Sizzler- Denver
1 Mile · 5K · 10K · From $17 · Carpenter Park/Thornton Recreation Center Park
2 miles away
RMRR Fall Marathon Training Series
10 Mile · From $20 · Riverdale Ballfields in Thornton
Less than a mile away
RMRR Fall Marathon Training Series #2
From $20 · Riverdale Ballfields in Thornton
Less than a mile away
RMRR Fall Marathon Training Series #3
10 Mile · From $20 · Riverdale Ballfields in Thornton
Less than a mile away
Plan your trip
Make it a Racecation
Coming from out of town? There's more to Thornton than race day. We'll help you line up nearby lodging, flights, a rental car, and things to do so you can make the most of your racecation.
Plan your trip to ThorntonFrequently Asked Questions (FAQs)
What is the RMRR September 5k/10k?+
When and where is the RMRR September 5k/10k?+
How do I register for the RMRR September 5k/10k?+
RMRR September 5k/10k
Sep 13, 2026