Open Water Swim & Run Series

Join us between 06/07 - 08/23/2025
(race date estimated)

Open Water Swim & Run Series Race Description

 

 

Horsetooth Tri Training Open Water Swim and Run Series

Choice of open water swim distance (500m-2000m) followed by an optional 5k run. Swim distance is selected at check-in on event day.


Open Water Swim & Run Series location map image
  • Open Water Swim & Run Series Where & When
  • Location: Horsetooth Reservoir - South Swim Beach, Fort Collins, CO 80521
  • Race Dates: 06/07 - 08/23/2025 (race date estimated)
  • Categories:
    • EVENT DAY REGISTRATION

Open Water Swim & Run Series Reviews

5 - 1 reviews

Review Open Water Swim & Run Series

Most Helpful Review
5.0/5
Course: 5.0/5
Organization: 5.0/5
A blessing in Fort Collins

I have participated in Horsetooth Tri Series for five years: well organized: safety for all athletes is a top priority, and they make it fun to participate: it has become a family feeling and gathering on Wednesday nights: we are lucky to have Green Events and Horsetooth apart of NOCO

Robinson R.

Other Races You May Want to Consider

Christmas Classic 5K

 - Dec 13th, 2025
  A festive run for the season!  The course will start out going counter-clockwise around Sloans Lake and through the Central Avenue tunnel continuing counter clockwise around the Airport Golf course back through the tunnel and then contin... read more

Carbon Valley Half Marathon & 5K

 - May 9th, 2026
Colorado at its Best - the Carbon Valley Half Marathon will showcase the beauty & diversity of Colorado's best-kept secret nestled right between Denver & Fort Collins. Small town charm with Big City services, Firestone & Frederick are th... read more

Wyoming Marathon Races

 - May 24th, 2026
    48th Annual! 50k, Marathon, Half-Marathon, and 5k events.  Hilly out and back on mostly dirt and gravel roads (100% for the Half and 77% for the Marathon and 50k) in Medicine Bow National Forest of Wyoming.  This is one of th... read more

Kristy's Kindness 5K

 - Jul 18th, 2026
    History: Several years ago, Kristy began a tradition of completing random acts of kindness to bring joy to others between Thanksgiving and Christmas each year.  In September, 2021, Kristy suddenly passed away. To honor her me... read more

T-Bird Trek Half Marathon, 10K & 5K

 - Sep 13th, 2026
2026 Registration Information Remember, packet pickup is Saturday, September 12, from 10 am - 3 pm Packet pick up will be at the University Union Building - 1st floor Race start times for Sunday, September 13, 2026: Half Marathons start @ 7 a.... read more

Memorial Day Run DENVER/AURORA

 - May 23rd, 2026
Description Honor, Remember, and Run for Freedom This Memorial Day, join us for the Memorial Day Freedom Run - a special event that combines a run with the powerful spirit of remembrance.  Whether you're running solo or with friends and famil... read more

Chilly Cheeks Winter Duathlon

 - Feb 21st, 2026
The event starts with a 2.5M run with a 10M bike ride on paved roads and followed by another 2.5M run.  The run covers a mix of road, paved bike path and well maintained dirt trails.    Road bike and fat tire divisions are offere... read more

Ralston Creek 5k and Half Marathon

 - Feb 15th, 2026
The Ralston Creek Half Marathon and 5K follow a mix of roads and bike paths on the west side of Arvada. The 5K is mostly flat and fast, with a small rise in the final mile.  The opening four miles of the half-marathon are fairly flat, with a ba... read more

Resolution Run 5K - Fort Collins

 - Dec 31st, 2025
Run out the old year, and welcome the new! Now in its 42nd year, the Resolution Run is a family-friendly, neighborhood streets 5K starting & finishing at the Edora Pool Ice Center.Kids, strollers, dogs & walkers welcome!Finish in under 20:26... read more

Cinco De Mayo Run DENVER/AURORA

 - May 2nd, 2026
Description Run Against All Odds: Cinco de Mayo Run!  This Cinco de Mayo, challenge yourself and celebrate resilience, community, and culture with the Cinco de Mayo Run Against All Odds! Whether you’re running for fun or for fitness, th... read more

Join us at the Open Water Swim & Run Series in August for a great race. The Open Water Swim & Run Series works hard to deliver you a memorable race experience. We would love to hear from you, so consider writing us a review.

Write Review

Contact Information

If you have any questions or comments for the event directors, click the button below.
Please include all fields
Contact email for event director is invalid. Please try again later
Race Entry has sent your message to Open Water Swim & Run Series.

An error occurred

 

Open Water Swim & Run Series - Disclaimer