Diamond Mountain Triathlon
About this race
Welcome to Diamond Mountain Triathlon,
hosted in the scenic heart of Harriman State Park. The course features a calm lake swim, a rolling 15-mile bike loop with spectacular views, and a fun lakeside run to the finish. The event is beginner-friendly while still rewarding strong competitors.
Rain or shine, we race — and we’re excited to share the course with you.
What the event offers:
Relaxed and convenient midday start
Police-controlled intersections
Course signage and volunteer support
Race photographers
Free public parking
Junior athletes race Duathlon with adults for free
Junior athletes race Triathlon for free and may have a separate start
Finisher medals for all participants
Awards for Top-3 Men & Women in both Triathlon and Duathlon
Overall Adult Triathlon Winners are getting champion suit:
Free jersey for Triathlon participants:
Duathlon participants are getting running jersey
Follow our race at @Diamond_Mountain_Races
Race Schedule
Date: Sunday, September 20
Start Time: 12:00 PM
Cutoff: 2:20 PM
Awards: ~10 minutes after Top-3 Women finish (Triathlon + Duathlon)
Race Location:
Lake Welch Beach
800 Kanawauke Rd, Stony Point, NY 10980
Only the Kanawauke Rd entrance is open before the event (Exit 14 at Palisades Pkwy)
Race course:
Triathlon: 0.5mi swim in Lake Welch. Biking is one 15-mile lap around the park, Strava record is here. 2 mile run, Strava record is here.
Duathlon: Both runs are the same: 2 miles, Strava record is here. Biking is one 15-mile lap around the park, Strava record is here.
Transition at Lake Welch picnic area. See maps on the bottom of the page.
Registration for Triathlon and Duathlon:
Check-in opens 1 hour before start and closes 20 minutes before start.
Online registration is recommended — it keeps things smooth and helps avoid mistakes at the table.
Bike Race Info:
Interested in the cycling race at the same venue?
Registration for the Diamond Mountain Classic is at:
BikeReg.com/DMC
Note: you can participate only in one race since they're running simultaneously
Race numbers
Jersey number should be placed on the front. Bicycle number goes either on the seat post (more aero) or on the top tube. Helmet number goes on the front. Registration desk has markers to draw a number on the left arm and leg for your swim.
Race results: Draft results will be posted shortly after the last finisher (no later than 2:45 PM).
Official online results (with transition splits) are normally available within 48 hours.
Awards: Top-3 Men and Women for each race get medals and merchandise. Age group awards will be offered if turnout meets minimums. Rest of participants get finisher medals.
Overall Man and Woman triathlon winners get special triathlon suit with race logo as an award.
Photos: will be published within 48 hours at Verrazano Team Facebook page .
9/21/25 Diamond Mountain Triathlon:
By @bikerjun here
By @photovelo.co here,
4/27/25 Diamond Mountain Duathlon:
By @bikerjun DM Duathlon, All Podiums
By @photovelo.co here
Swim notes: Wetsuits welcome.
Body marking on the left arm & leg helps timers during swim exit.
Bicycle requirements: Any bike is fine — just make sure it’s in safe working condition and suited for rolling terrain. No rental bikes will be available.
Facilities:
Free parking
Open restrooms
Water available at check-in
Trash bags provided
About Us: Verrazano Team is a NYC based club organizing multisport and cycling events throughout the city. Our goal is to create safe, well organized, and welcoming races that support local athletes, juniors, and newcomers to multisport.
Pick your distance
Triathlon
Adult Triathlon (0.5mi/15mi/2mi)
0.5mi swim in Lake Welch 15 miles bike around Harriman Park (1 lap) 2 miles run on paved road with some gravel sections
Junior Triathlon (0.5mi/15mi/2mi)
0.5mi swim in Lake Welch 15 miles bike around Harriman Park (1 lap) 2 miles run on paved road with some gravel sections
Duathlon
Adult Duathlon (2mi/15mi/2mi)
2 miles run on paved road with some gravel sections 15 miles bike around Harriman Park (1 lap) 2 miles run on paved road with some gravel sections
Junior Duathlon (2mi/15mi/2mi)
Starting with adults 2 miles run on paved road with some gravel sections 15 miles bike around Harriman Park (1 lap) 2 miles run on paved road with some gravel sections
Typical race-day weather
Based on 3 years of Open-Meteo archive data for this event's race dates in Stony Point, plus the 3 days either side.
The sun rises at 6:41 AM and sets at 6:56 PM local time (EDT) in Stony Point on September 20, 2026 — 12h 15m 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.
Reviews
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2026 results — Diamond Mountain Triathlon
52 finishers across 2 distances · leading places in the Adult Triathlon (0.5mi/15mi/2mi)
| Place | Name | Time | Pace |
|---|---|---|---|
| 1 | Alex Reich | 1:14:17 | 4:15 /mi |
| 2 | Jeremy Stoll | 1:17:49 | 4:27 /mi |
| 3 | Fernando Ferreira | 1:17:49 | 4:27 /mi |
| 4 | Misha SemeLev | 1:22:03 | 4:41 /mi |
| 5 | Ian Cheung | 1:24:54 | 4:51 /mi |
Every finisher is on the results page, filterable by distance, gender and age group.
All results by year
Other races near Stony Point
Different organizers, within 40 miles, in the next three months
Town of Cortlandt 5k Road Race
Empire State Half Marathon & 5k
5 Mile Turkey Trot for The Marisa Fund
2026 Harry Chapin Memorial Run/Walk Against Hunger
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, 4 Stony Point events
Spotted something wrong? Tell us and we'll fix it.