Diamond Mountain Triathlon (USAT Sanctioned)

  • Date Sun 20th September 2026
  • Time 12:00PM EDT
  • Location Stony Point, New York
  • Price Free - $110.00
  • Races 5 races

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Event summary

Get ready for an exhilarating day of athleticism and camaraderie at the Diamond Mountain Triathlon, taking place on Sunday, September 20, 2026, in the picturesque Stony Point, Rockland, NY! Nestled in the scenic heart of Harriman State Park, this USAT-sanctioned event promises an unforgettable experience for both beginners and seasoned competitors alike.

Participants can look forward to an exciting race featuring a calming 0.5-mile swim in Lake Welch, a thrilling 15-mile bike loop with breathtaking views, and a fun 2-mile lakeside run to the finish line. With a midday start time at 12:00 PM, racers will enjoy police-controlled intersections, ample course signage, and enthusiastic volunteer support throughout the event. Junior athletes will also have the chance to compete for free in both the Triathlon and Duathlon, making this an inclusive event for all ages!

Whether you're aiming for a personal best or simply soaking in the vibrant atmosphere, the Diamond Mountain Triathlon offers finisher medals for all participants and awards for the top-3 men and women in both races. Join us for a day full of excitement, community spirit, and the thrill of competition as we race rain or shine!

Organiser's Description

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 were 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

[https://www.instagram.com/diamond_mountain_races/]



FOLLOW OUR RACE AT @DIAMOND_MOUNTAIN_RACES [https://www.instagram.com/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 [https://www.strava.com/segments/37649616]. 2 mile run, STRAVA record is HERE [https://www.strava.com/segments/38801063].
DUATHLON: Both runs are the same: 2 miles, STRAVA record is HERE [https://www.strava.com/segments/38801063]. Biking is one 15-mile lap around the park, STRAVA record is here [https://www.strava.com/segments/37649616].
TRANSITION at Lake Welch picnic area. See maps on the bottom of the page.

Registration for Triathlon and Duathlon:
TRIATHLON OPTIONS:
Elite/Advanced Triathlon
Open/Family Triathlon - Last Wave with personal buoys allowed
Junior Triathlon - Racing with adults, Last Wave by default unless sent email and asked to start with the first wave.
Note: all Triathlon waves are scored together

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 [https://www.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 [https://www.facebook.com/VerrazanoTeamRacing] .
9/21/25 DIAMOND MOUNTAIN TRIATHLON:
BY @BIKERJUN HERE [https://www.facebook.com/media/set/?vanity=BikerJunPhotos&set=a.1560020232018593]
BY @PHOTOVELO.CO HERE [https://photos.google.com/share/AF1QipPIgsJYOErqgYONuHWrXRiCvnEafHMDQpjq0JvbDk-xV4vy2vUIZUdYeQvx8HiN0A?key=enlzXzJTS0V0Y2NJVWp3X0V6NExWLW9CZlFlYXZR],

4/27/25 DIAMOND MOUNTAIN DUATHLON:
By @BIKERJUN DM DUATHLON [https://www.facebook.com/media/set/?set=a.1437454594275158&type=3], ALL PODIUMS [https://www.facebook.com/media/set/?set=a.1437456400941644&type=3]
By @PHOTOVELO.CO HERE [https://photos.google.com/share/AF1QipNfw-_1o1U-ZOEMZYfTktNJ_-YjIAYBaYvES398sPBiN2D8-fk3zxRt-YdOrvOEEA?key=VE95MFlLOWlRQjg0eGMwdERvOHJVeGFaMzFBNjFn]

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 its 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 [https://www.instagram.com/verrazanoteamracing/]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.

Races

  • Elite/Advanced Triathlon (0.5mi/15mi/2mi) First Waves

    Sun 20th September 2026 (12:00PM EDT)

    $110.00

    0.5mi swim in Lake Welch 15 miles bike around Harriman Park (1 lap) 2 miles run on paved road with some gravel sections Athletes who want a competitive start and expect to race independently - first waves start
  • Open/Family Triathlon (0.5mi/15mi/2mi) Last Wave With Personal Buoys Allowed

    Sun 20th September 2026 (12:00PM EDT)

    $110.00

    0.5mi swim in Lake Welch 15 miles bike around Harriman Park (1 lap) 2 miles run on paved road with some gravel sections For juniors, athletes who prefer the second wave, friends and family members who would like to start together.
  • Junior Triathlon (0.5mi/15mi/2mi) Last Wave by Default

    Sun 20th September 2026 (12:00PM EDT)

    Free

    Starting and scored with adults 0.5mi swim in Lake Welch 15 miles bike around Harriman Park (1 lap) 2 miles run on paved road with some gravel sections You can ask to move you to first wave before registration is over and we will do our best to move you
  • Adult Duathlon (2mi/15mi/2mi)

    Sun 20th September 2026 (12:00PM EDT)

    $90.00

    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)

    Sun 20th September 2026 (12:00PM EDT)

    Free

    Starting and scored 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

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Location

800 Kanawauke Rd, Stony Point, 10980, NY, United States

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