Swim Series

Open Water Swim Series

Every Wednesday at 6:00 pm | June 7th – August 16th

The Open Water Swim Series is an 10 week event consisting of a swim/run sequence. It is designed as a weekly practice & training opportunity for anyone considering or planning on participating in a triathlon.  Also a great event for swimmers who want to get out in the open water!


Each event begins with an open water swim, at a distance of your choice, followed by an optional 5k run & post-run beach yoga. There will be a mass start for all swim distances to help familiarize you with the open water start of a triathlon.




There are several event distances to choose from every week:

500m Swim & 5k Run

1000m Swim & 5k Run

1500m Swim & 5k Run

2000m Swim & 5k Run

2500m Swim Only

3000m Swim Only


You will select your swim distance & run option when you check-in for the event.  You can change the swim distances at any time (even during the swim), please just let us know if you want to switch distances or if you swam a different distance.

Swim Course


Event takes place at the South Beach of Horsetooth Reservoir.

Click Here to view Course Map



The event is timed but because it is a non-competitive training series it is not professionally timed and there are no overall or age group awards.

Click Here for Point Series Awards



Results include swim time & total time. Transitions are not separately timed. Times will be posted the by 5:00pm the Friday following each event.

Click Here to view Results

Water Temp


60°-70°F during the month of June
70°F during the month of July
70-74°F during the month of August

Wet Suits


Wetsuits are not required for participation but it is recommended for most participants for the extra warmth and buoyancy they provide.