Mountain Swim Series Announces Race Dates

The organizers of Mountain Swim Series are really excited for a 2021 race season! “The State of Colorado has provided guidance for outdoor events this summer, and we expect to host all four of our open water swims this summer!”​

The 2021 Mountain Swim Series dates are on the books, check them out below, and registration opens on the first week of February. You will get an email letting you know that registration is open! But first, a couple of quick notes:

There is NO have race-day registration this year, and we will have to close registration 1-week in advance of all races. Please sign up early if you
want to swim!!

“We have an exciting line-up of swims and are including additional race options, a 500 YD swim at the Solstice Sunset Swim AND Chatfield Classic. This distance will be a great opportunity for new open water swimmers, new triathletes, and KIDS! All kids who participates in this race will be receiving a finisher prize!”

The dates for the swim series are as follows:

Solstice Sunset Swim – Longmont, End of June, not yet confirmed:
This event includes a 1.2 mi, 2.4 mi, and the NEW 500 YD swims!

Carter Lake – Saturday July 17th, 2021: 
An out and back 3-mile swim, similar to 2020, in beautiful Northern Colorado.

Chatfield Classic – Sunday August 15th, 2021: 
Limited to 200 participants, sign up in while there is still space!  
This event includes a 500 yd, 1 mile and 2 mile swim!

The Castle 2.5K/5K/10K – In Bailey, Saturday August 28th, 2021: 
This is the highest altitude organized marathon swim event in the country! We will have the camping option again on Friday night – which you’ll find through the swim registration site. Camping is $40 for a 4 person site and will decrease your morning day of drive

Registration information and updates for the year can be found at

We always need volunteers! If a significant other, friend, child (16 and over) is coming with you, we would love them to volunteer with us! If you are trying to decide to do one of the swims or new to open water swimming, volunteering is also a great opportunity! We couldn’t do this without our volunteers! In 2020, we will be continuing the tradition of giving our volunteers a free race entry after a volunteer shift!

To volunteer, sign up here:

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