Denver Zoo Map
Colfax Half Marathon is the exclusive race to run through Denver Zoo.
May 17, 2014

Colfax Marathon

8:00am to 5:00pm

On your mark. Get set. RUN! Run for Denver Zoo on May 17 or 18 in one of the Colfax Marathon race series, and help raise funds for a great cause – animals!  Participate in the 13.1 mile Colfax Half Marathon, the exclusive race to run through Denver Zoo. When you register to race be sure to choose Denver Zoo as your charity partner!

Additional Information



Denver Zoo is looking for the fastest cats around to help us achieve our mission to secure a better world for animals through human understanding. Funds from runners will support Denver Zoo projects like baby proofing for a tapir that is on the way and a new veterinary device to help provide even better care for our giraffes!

2 days, 7 races. Which will you run?

Over the two day period, runners can pick from seven races.

Marathon weekend kicks off on Saturday, May 17 with the Colfax 5K in City Park.

The 13.1 mile Half Marathon is the only race to run a one mile trek through Denver Zoo. It’s an entirely new way to experience the zoo! The Half Marathon sold out in 2013. Sorry, no spectators in Denver Zoo.

The 26.2 mile Colfax Marathon runs through Sports Authority Field at Mile High Stadium twice - at miles 6 and 20. Highlights include Denver Fire Station #1, Cherry Creek, Sloan's Lake, downtown and Colfax Avenue. The race is a Boston qualifier.

The Urban 10 Miler runs the final miles of the marathon course: through the stadium, Confluence and downtown. Spots are limited and this race sold out in 2012 and 2013.

Five runners share the 26.2 mile course in the Marathon Relay. Colorado's biggest corporate race is part of the Marathon Relay: the Corporate Cup and Government Cup. Open relay teams, company and government office teams compete for $50,000 in cash awards for nonprofits in the Charity Partner Program. 

Half Marathon Through Denver Zoo

The 13.1 mile Colfax Half Marathon is the only race through Denver Zoo, with a one-mile portion of the race.  Runners may wonder who's watching who in the zoo: the monkeys, mountain sheep, elephants and the rhino really get a kick out of the race. Enjoy fast, flat and shady boulevards in Denver's historic Park Hill neighborhood - and the favorite run through Aurora Fire Station #1. Along the way, enjoy some quintessentially Colorado entertainment.

The Colfax Half Marathon will run through Denver Zoo the morning of May 17. The race starts at 6:45 a.m. and will already be through the zoo before it is open to the public at 9 a.m. 

Sorry, no spectators in Denver Zoo. 

Learn more.

Register Now

Runners register online for all races at During the registration process, runners will have the opportunity to select Denver Zoo as their Charity Partner.

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