2021 UPDATE:

We are excited to announce that planning for the 2021 GTIS Half Marathon is underway! The event will be held in-person with a virtual option on Saturday, August 14, 2021. We are excited to be partnering with the Colorado Mountain Half Series again in 2021  - with a limited number of spots available at each event. Please know that safety is our number one priority and we will be working to ensure a safe and socially distanced event. We invite you to check back in March as we plan to open up registration then. Start training now for one of Colorado’s most scenic half marathon events!

Georgetown to Idaho Springs Half

Saturday, August 14, 2021
Colorado at its Best! Run a PR at one of Colorado's oldest half marathons!
43nd Annual GTIS HALF
August 14, 2021
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For the folks who have already registered for the 2020 GTIS Half, we have some options for you to choose from.
Please select your choice of refund/deferral or virtual by clicking here. 

Here are your options:

  1. Run 2020 GTIS Half Marathon as a virtual race through the Colorado Mountain Half Series Challenge. Your $60 race fee will go toward this option - stay motivated through the summer with us and support the three non-profits who are the beneficiaries.

  2. Defer my entry to the 2021 GTIS Half Marathon.

  3. Refund my registration less the $25 cancellation fee (this fee covers race costs that our non-profit has already incurred). We appreciate your understanding.

  4. Donate my entry - proceeds benefit the Clear Creek Booster Club who are a group of parents and community members that support Clear Creek High School and Clear Creek Middle School. The main fundraising event each year is the GTIS Half Marathon, as such your registration will be applied as a tax-deductible donation to the Clear Creek Booster Club.

  5. If you DO NOT make a selection by June 5, 2020 your registration will be automatically deferred to the 2021 GTIS Half Marathon.



Three of Colorado's original and most beloved half marathons have teamed together to create the Colorado Mountain Half Series!

While we cannot be together this year for the Colorado Mountain Half Marathon Series due to the COVID-19 pandemic, we invite you to keep healthy and active with us in our three half marathon "Do the Distance" 39.3 Mile virtual challenge. You will get a virtual audio experience along with great swag and unique special Colorado Mountain Half Series Medal and shirt for the "Do the Distance 39.3." The event will benefit all three event's youth programs. Learn more at comtnhalf.com.





Fill out the form below and we'll get back to you shortly or contact us at: gtishalfmarathon@gmail.com

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