Join us in celebrating our 45th year!!  

Georgetown to Idaho Springs Half Marathon is a Colorado Runner’s Must-Do. This iconic Half Marathon is one of the most pleasurable races in the western US. The point-to-point course is a scenic and gently rolling downhill mountain course that winds down the Clear Creek Valley -- starting at an elevation of 8,500ft. at Georgetown Lake and ending at an elevation of 7,500ft. in Idaho Springs, with one hill of a finish!

​This event is hosted by the Clear Creek Booster Club, and it is planned by parent volunteers. Proceeds from the GTIS Half Marathon go directly to supporting middle school and high school students in Clear Creek County.

This is Colorado at its best!

"By far one of the most beautiful runs I have ever done" - participant

Start Time

We will once again host a rolling wave start, releasing small groups about every 15 minutes.  This best suits the path in the early part of the course.  YOU get to select your start time during registration (once a wave reaches capacity, it will no longer be available).

7:00 a.m. First wave start

7:15 a.m. Second wave start

...this will continue every 15 minutes until 8:30AM.  Wave capacities are limited.  Encourage friends and family to sign up along with you so that you can all start together.  

The course will close at 12PM, please keep this in mind when selecting your start wave time.   

Run Perks

Custom finisher medal, great shirt, fresh mountain air, beautiful scenery, and a fun post-event celebration.  (Tshirts guaranteed to those registered before 12noon on July 26th)

Location

Race start is in Georgetown, next to Georgetown Lake on the frontage road and finishes in Idaho Springs.  COURSE MAP

PARKING & SHUTTLES

The most up to date information for parking and shuttles will be updated found on the race info page of the event website (https://www.gtishalf.com).

The first shuttle(s) will leave Idaho Springs around 6/6:15AM.  Please plan accordingly.  More details about parking and shuttles will be forthcoming as the event gets closer!

Shuttles to the start line are for participants ONLY, no spectators. 

**There is NOT shuttle service back to Georgetown post-event.  

Advance packet pickups:

Bib Pickup at the Start Line in Georgetown on race morning

• starting at 6:30am and continuing until the start of the final wave.

Learn more at www.gtishalf.com

Colorado Mountain Half Series

We all love a Colorado original and we certainly love the beauty and tranquility of our rocky mountains.  Five wonderful events are now part of the Colorado Mountain Half Series, join us for 3, 4, or all 5 events and be part of this fun series of events.  Earn points towards series awards, collect some fun swag and best of all enjoy some great discounts on registration fees! 

Events include: Estes Park Half Marathon, Georgetown to Idaho Springs, Mt Sneffels Half Marathon, NedNed Half, and the Lead King Loop 25K.

Learn more at Colorado Mountain Half Series Website