Diamond Lake Triathlon



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Diamond Lake Triathlon

Race Details

Date: Saturday, July 15, 2023

Location: Diamond Lake Marina, 21268 Shore Acres Rd
Cassopolis,   MI   49031

Start Time: 7:30 am for first wave


$85 for individual includes: Chip timing, Custom soft cotton T-shirt with race logo, AG awards and post race refreshments. Two person relay team and three person teams also available.


Diamond Lake Marina (next to the Yacht Club), 21268 Shore Acres Rd
Cassopolis,   MI   49031

Packet pickup and onsite registration is at the Marina/race start location.

Friday, July 14 from 4:00 – 7:00 pm [Athletes must pick up their own packet and show ID]

Saturday, July 15 from 5:45 am – 7:00 am


Sail boats to the Top 3 overall

Traveling trophy award for best team

AG awards three deep in 15 different age groups


See the maps below.


Not sure if you remember, but Roger Antoniu and I started this race in Leslie Paul’s backyard. There was this giant willow tree and after the race we had a big cookout. The transition area was in the street…. Fun times. We are SO lucky to have access to this fabulous lake and the generosity of the Diamond Lake Marina to host. Transition area will be in their lot, next to the white garage. Grateful for everyone who has put in blood, sweat and fears to keep this event going! Photos below were from 2016!


Epic Race Timing

Event facebook page


Bike Course is out and back 12 miles

Run course is out and back, with fabulous lake view and 3.3 miles.

We’re going back a few years here, the overall sailboat awards have gotten much larger!

The bike course goes around the lake, onto a country road and back. The portion along the lake is chock full of great views and gorgeous homes with lush trees!

Again this photo is of yesteryear, but you can imagine running along side the water and being lifted by old trees and great views!