Diamond Mountain Triathlon

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.

Triathlon: 0.5mi swim, bike is one 15mi lap, 2mi run
Duathlon: First and 2nd run are the same 2 miles, bike is one 15mi lap:

 

Bike course (1 lap total):