TYathlon Sprint Triathlon & 5K
About this race
Swim, bike and run around beautiful Lake Mahopac in support of childhood cancer research. If a sprint triathlon is not your speed, join us for our 5K! The 5K is family-friendly, and allows for strollers on the course. The sprint triathlon brings together a combination of seasoned pros (our elite field is fierce!) as well as many beginners who are just getting their start in the triathlon world. It is typically a gorgeous morning with perfect fall-like weather in the Hudson Valley.
This is our 14th year of celebrating the important work being done to help change the landscape for children diagnosed with cancer. All proceeds support the Ty Louis Campbell Young Investigator Fund at New York-Presbyterian Weill Cornell.
Pick your distance
Triathlon
Sprint Triathlon
.25 mile swim in Lake Mahopac (in-water start) 10.5 mile bike (two loops) around Lake Mahopac 2.7 mile run *this distance is to prioritize the safety of our participants
Sprint Triathlon Relay
.25 mile swim in Lake Mahopac (in-water start) 10.5 mile bike (two loops) around Lake Mahopac 2.7 mile run *this distance is to prioritize the safety of our participants A minimum of two and maximum of three participants are allowed.
Running
Family-Friendly 5K
The 5K brings together a mix of experienced runners and those looking to take a stroll around gorgeous Lake Mahopac. Strollers are welcome, you can walk, jog, or run it. All participants receive an event t-shirt and finisher medal.
Typical race-day weather
Based on 1 year of Open-Meteo archive data for this event's race dates in Mahopac, plus the 3 days either side.
The sun rises at 6:39 AM and sets at 6:57 PM local time (EDT) in Mahopac on September 19, 2026 — 12h 18m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 2 Mahopac events
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