Diamond Mountain Triathlon (USAT Sanctioned)

  • Date Sun 20th September 2026
  • Time 12:00PM EDT
  • Location Stony Point, New York
  • Price Free - $110.00
  • Races 4 races

Event summary

Get ready for the exhilarating Diamond Mountain Triathlon, taking place on Sunday, September 20, 2026, in the stunning Stony Point, Rockland, within the picturesque Harriman State Park. This USAT sanctioned event promises a fantastic day of athleticism and community spirit, featuring a 0.5-mile swim in the serene Lake Welch, a challenging 15-mile bike loop through rolling terrain, and a scenic 2-mile run by the lakeside, perfect for both seasoned triathletes and beginners alike.

Participants can look forward to a relaxed midday start at 12:00 PM, with police-controlled intersections and ample volunteer support along the course. Junior athletes can join the fun too, racing for free in both the Triathlon and Duathlon events! Medals await all finishers, and top competitors will receive special awards, including champion suits for the overall winners. Whether you’re racing solo or teaming up with family members, the Diamond Mountain Triathlon promises an unforgettable experience filled with camaraderie, competition, and breathtaking views. Don’t miss out on this incredible opportunity to challenge yourself and enjoy the great outdoors!

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:
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

  • Adult Triathlon (0.5mi/15mi/2mi)

    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
  • 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 Triathlon (0.5mi/15mi/2mi)

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

    Free

    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 Duathlon (2mi/15mi/2mi)

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

    Free

    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

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Location

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

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