Half marathonRoad🇺🇸 Denver, United States

Colfax Half Marathon

Sunday, 16 May 2027In 7 months · Start 06:00

Starts and finishes in City Park at about 1,600 m and is the only half marathon that runs a mile through Denver Zoo, before heading down Colfax Avenue past the Capitol and back along 17th Avenue.

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Facts checked 23 Oct 2026 against runcolfax.org, denver7.com, runcolfax.org.

Elevation gain

90 m

Flat · ↓ 90 m

Highest point

1,625 m

above sea level

Temp at start

8°C

Peaks around 18°C

Entry fee

Check site

Open entry

Finishers

—

typical year

Course

Loop

Cut-off: check site

Getting thereFly into DEN (Denver), about 27 km from the start

Course map

A detailed route is not available for this race yet. The marker shows the race location.

Elevation profile

Flat: about 90 m of climbing and 90 m of descent. A detailed profile isn’t available for this race yet.

Race-day weather

At start

8°C

Peak during race

18°C

Humidity

60%

Chance of rain

13%

Wind

9 km/h

16 May in past years

Historical averages for 16 May ±3 days, 2016–2025, from 06:00 for 5 hours (70 days sampled). Source: Open-Meteo / ERA5.

Finish times by age group

No data yet. We’re collecting age-group results race by race.

Runner reviews

What time could you run here?Adjust your goal time for this course’s hills and typical race-day weather.Race time calculator →

Guides for this race

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<a href="https://irun42.com/race/denver-half" title="Colfax Half Marathon on iRun42"><img src="https://irun42.com/badge/denver-half.svg" width="300" height="120" alt="Colfax Half Marathon: course, elevation and race-day weather on iRun42" /></a>

Plan your trip

Searches are set for Denver and the race weekend.

Hotels near the start lineClosest first · 2027-05-15 → 2027-05-17Booking.com Flights to DenverArrive 2027-05-14, fly home 2027-05-18Google Flights Things to do in DenverTours and attractions in United States for the days around the raceKlook Mobile data in United StatesAn eSIM for maps, tracking apps and results on race dayAiralo Airport transfer from DENDenver airport is about 27 km from the startKiwitaxi

Gear for this race

Lightweight running shoesBuilt for fast road miles Energy gelsFuel for race day

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Around the same time

All races in May 2027 →