Colfax Marathon
About this race
Relay race
Pick your distance
Running
Colfax Marathons Relay
Typical race-day weather
Based on 1 year of Open-Meteo archive data for this event's race dates in Lone Tree, plus the 3 days either side.
The sun rises at 5:43 AM and sets at 8:08 PM local time (MDT) in Lone Tree on May 17, 2026 — 14h 25m 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.
Reviews
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Other races near Lone Tree
Different organizers, within 40 miles, in the next three months
HRCA Backcountry Wilderness Half Marathon
PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA
Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA
Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA
🏃 Plan Your Next Race in Lone Tree
Find upcoming events by distance:
- Lone Tree Running Calendar 2026 4 races
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, 5 Lone Tree events
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