NEW: Lonetree Sprint

July 31, 2021 – 7:30am

General Information

We’re excited to announce that in our 20th year we’ll be adding a brand new race, completely separate from the Lake to Lake Triathlon – the Lonetree Sprint.

With a slightly longer bike than your traditional Sprint, this event caters perfectly to those who enjoy spending time in the saddle, especially through our beautiful Colorado Foothills.

Register to take part in our inaugural event! See below for information on categories and awards.

First 20 registrants may use the code LONETREE20 for 10% off their registration!


  • 750yd Swim
  • 18mi Bike
  • 5k Run


Lonetree Reservoir is located just south of Loveland, CO.  500 acres of OPEN WATER, nestled on the west side of the Heron Lakes subdivision and TPC Colorado. Great water, beautiful views and quick access to the transition area.  Read course details below:


750 yd clockwise swim. What do we love about this swim? The swim start and swim finish points begin and end on long concrete boat ramps. No mucky entrance into the water or at the exit. Blue Heron rookery on the south east side of the reservoir, it’s possible a few of them will be there to watch you begin and finish! Nice water~ nice views.


18 mile course that takes you west towards the foothills. No great elevation gains here, 421 ft. total and no spectacular elevation loss, 425 ft. total. At mile two, you’ll begin a gradual climb towards the foothills and at mile five a nice downhill towards WCR 20 (W. 1st St.)  A few climbs, and few downhills, miles 10-11 a quick climb to CTY RD 18. Nice downhill to CR21, back south to CR16. CR16 will take you past Lon Hagler Reservoir as you wrap back around to SW42nd St and back the transition. NO stoplights!


Out and back course flat, just over two miles on asphalt and one mile on dirt road. Shade? Not really, so we’ll have aid stations stocked with cool water and fluid replacement drink. 


This event will be capped at 300 due to the unabundant parking. We will have designated parking and ask on race day that you are respectful of the properties nearby and park only where we direct you. Carpooling is encouraged!

Registration Cost

No Race Day registration.

Sprint ENTRY

Registration Open – May 22:  $85
May 22 – July 10:  $95
July 11 – Registration Close:  $100

SUP category ENTRY

Same as Sprint above


Registration Open – May 22:  $80
May 22 – July 10:  $90
July 11 – Registration Close:  $100


$135 (No price increase)

Categories & Awards

Sprint Event

Distances: 750yd swim, 18mi bike, 5k run

  • Overall: Top 3 overall male and female (not duplicated with age group awards)
  • Age Group: Top 3 male and female in each age group:
    14-15, then 16-17, 18-19, 20-24, 25-29..etc
    Athletes under the age of 14 are allowed to compete as part of a relay in the swim or run leg.)

SUP - Stand Up Paddle Board Category

Distances: Same as Sprint event
Awards: Top 3 overall male and female

*Must provide your own SUPs


Clydesdale: 220+ lbs.
Athena: 165+ lbs.

Distances: Same as Sprint event
Awards: Top 3 overall male and female


3 divisions: Female, Male, Mixed

Distances: Same as Sprint event
Awards: Top 3 from each division


First timer wave will start last, with smaller numbers per wave (no more than 50)

Distances: Same as Sprint event
Awards: Top 3 male and female (separate from age group category)

Register to Race

We hope you’ll hang out for postrace awards and food. We’ll have some fun giveaways!

Volunteers – All events need numerous volunteers to run a safe and organized event. Some local youth organizations will be benefiting from this event and helping run the race, but there is always need for more volunteers! If you would like to volunteer and enjoy a free lunch and T-shirt, email Peggy Shockley.