47th Annual
GTIS HALF
AUGUST 9, 2025
Colorado at its Best!
47th Annual
GEORGETOWN TO IDAHO SPRINGS HALF MARATHON
GEORGETOWN, CO
August 9, 2025
Run a PR at one of Colorado's oldest half marathons!
Part of the Colorado Mountain Half + Series, 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.
RUN PERKS
You get: Custom finisher medal, great shirt (designed by one of the students at Clear Creek High School or Middle School), fresh mountain air, beautiful scenery, and a fun, post-race celebration! Join us this year as we celebrate 47 years of the GTIS Half Marathon!
INCLUSIVE
EVENT
POST RACE
FESTIVAL
FINISHER MEDALS & CUSTOM AWARDS
PART OF THE
COLORADO MOUNTAIN
HALF + SERIES
Run Your Tranquility in 2025: FIVE of Colorado’s original and most beloved half marathons have teamed together to create the Colorado Mountain Half+ Series! Start the series with the Estes Park Half Marathon, then run a PR at our very own GTIS Half, enjoy the "Switzerland of America" and run the Mt. Sneffels Half Marathon, experience Nederland at the Ned*Ned Half Marathon and finish the series with the Lead King Loop 25K (15.5 Miles) in breathtaking Marble, CO.
The Perks: Register for the series and save 15%. Overall and age group series awards and prizes and get discounted branded Colorado Mountain Half+ Series gear. Learn more and sign-up at www.comtnhalf.com