Runner's Almanac
All marathons

Mid-May · Mountain West · Point-to-Point

Colfax Marathon

Denver, CO

Runs through Mile High Stadium & Denver Zoo

  • First Marathon
Official site

Opens the race organizer's website

Typical start temp
55°F(estimated)
Field size
~2,500 runners(estimated)
Course
Flat to rolling
Elevation
400 ft gain · 0 ft net(estimated)

Why runners choose this race

A point-to-point course around Denver, CO, with gentle rollers but no sustained climbing.

Good fit if

  • · First-time marathoners

Think twice if

  • · You have not trained at altitude

Course and logistics

Course type
Point-to-Point
Surface
Road
Total gain
400 ft(estimated)
Total loss
400 ft(estimated)
Net elevation
0 ft(estimated)
Field size
~2,500 runners(estimated)
Crowd support
Pockets of spectators
Entry
Data coming soon
Start / finish
Start and finish in different locations

Race details

Typical timing
Mid-May
Region
Mountain West
Editorial tier
Featured
Data last reviewed
2026-08-26

Runs through Mile High Stadium & Denver Zoo

Good to know

  • First Marathon
  • Point-to-point
  • Destination race

Race-day weather

Modelled from location, month and coastal proximity — not verified race history.

Typical start
55°F(estimated)
By midday
65°F(estimated)
Dew point
33°F(estimated)
ExcellentGoodWarmHeat risk

Typical start sits at 55°F — good conditions.

Similar races

Mid-September · Mountain West

Malad Valley Marathon

Malad City, ID

Weather
56°Ftypical start
Field size
~300 runners
Course
Rolling
Elevation
400 ft gain · 0 ft net

Event listed as: Marathon

PR6.8Weather8.4Experience6.0