Mountain Swim Series

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Denver, CO
Mountain Swim Series

With the aim of promoting fitness and health through open water swimming.

The Mountain Swim Series offers flexibility, competition and an overall enjoyable swimming experience. We have FIVE open water swims this year, and we can't wait to see you out there.
-Sunday June 5th -- Chilly Chatfield
-Sunday June 19th -- Solstice Sunset
-Saturday July 16th -- Carter Lake Crossing
-Sunday July 31st -- Chatfield Classic
-Saturday August 27th -- Castle 5k/10k
Register Here: https://mountainswimseries.com/

All events will be supported by safety watercraft, lifeguards, and paramedics/EMTs.

03/11/2026

Early Bird registration will close March 15th! Come on over to our site to see all of our swim options for the season!

mountainswimseries.com

03/05/2026

The final events for our 2026 Summer series all take place at Wellington Lake throughout the weekend of Aug 22nd! Make sure to check out the registration page for all the fun, including camping options!
Swim events include: 2.5K, 5K, or 10K
and the following day will be the Swim Run!

Early Bird Registration ends March 15th!
https://mountainswimseries.com/events/castle-10k

https://mountainswimseries.com/events/castle-swim-run

03/02/2026

Willow Creek Reservoir swim takes place August 1st this summer! This is one of our newest additions to our summer series. Options at this event include: 1 mile, 2 mile, 5K, 1 and 2 mile, and 1 mile and 5k swims!
See more information on our site! https://mountainswimseries.com/events/willow-creek-reservoir

02/25/2026

Carter Lake Crossing will be the second swim event this season on July 18th! This event is about 3miles across Carter Lake Reservoir!

Early Bird Pricing will end March 15th!
https://mountainswimseries.com/events/carter-lake-crossing

02/04/2026

Solstice Sunrise Swim will be the first swim of the 2026 Mountain Swim Series on Sunday, June 14th! At this event we have the 500YD swim (ages 21 and under), 1.2 and 2.4 miles!

Early bird registration will end March 15!
https://mountainswimseries.com/events/solstice-swim

01/17/2026

Happy New Year swimmers! 2026 early bird registration is open! We have a lot of swim events planned for this year, so check out our MSS site or registration page for more info:

https://mountainswimseries.com/

09/24/2025

Congratulations to our two 2025 Overall Series Winners! Your customized swim robes will be sent this week! Thanks Lemon Slice Printing for your embroidery work!!

09/15/2025

Thanks for everyone that participated in our 2025 series this year!! We hope to see you again next summer!
Big thanks to all of our volunteers who came out and supported the swims throughout the summer.

08/04/2025

Thank you to everyone who swam and volunteered at Willow Creek Reservoir!!
The final MSS Swims are coming up at Wellington Lake! We have the Castle 2.5K/5K/10K and the Swim/Run the following day. Lots of camping options when you register as well!
https://mountainswimseries.com/events/castle-10k

07/30/2025

The Willow Creek Reservoir Swim is THIS SATURDAY August 2nd. We would love more volunteers to sign up!
Sign up here: https://mountainswimseries.com/volunteer-signup

Willow Creek Reservoir Swim offers a 1-mile, 2-mile, and 5k option outside of Granby, Colorado!

07/13/2025

Registration for Carter Lake Crossing closes on Wednesday July 16th at 11:59 PM. There are only a few spots left. As you know, we are limited by a parking cap. If you log on and registration has closed due to reaching the maximum number of vehicles, please send us an email BEFORE Wednesday
Can't swim? We always need volunteers! Sign up on our website!!

06/25/2025

Next up in the summer line up:
July 19th Carter Lake Crossing
August 2nd Willow Creek Reservoir
Aug 23rd Castle swims (camping options available)
Aug 24th Wellington Swim Run Challenge!

Address

Denver, CO

Website

http://www.mountainswimseries.com/

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