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| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| Olympic Aquabike | AquabikeSwim 1,500 m · Bike 24.9 miOpen water swim | Jun 5, 20277:30 AM | $144$154 after Dec 31, 2026 | – |
| Olympic Relay Triathlon | Olympic TriathlonSwim 1,500 m · Bike 24.9 mi · Run 6.2 miRelay or teamOpen water swim | Jun 5, 20277:30 AM | $265$284 after Dec 31, 2026 | – |
| Olympic Triathlon | Olympic TriathlonSwim 1,500 m · Bike 24.9 mi · Run 6.2 miOpen water swim | Jun 5, 20277:30 AM | $144$154 after Dec 31, 2026 | – |
| Open Water Timed Practice Swim - 1500m | 1 Mile | Jun 5, 20277:30 AM | $44$47 after Dec 31, 2026 | – |
| Open Water Timed Practice Swim - 400m | Other | Jun 5, 20277:30 AM | $44$47 after Dec 31, 2026 | – |
| Open Water Timed Practice Swim - 800m | Other | Jun 5, 20277:30 AM | $44$47 after Dec 31, 2026 | – |
| Sprint Duathlon | DuathlonRun 1.5 mi · Bike 12 mi · Run 3.1 mi | Jun 5, 20277:30 AM | $123$131 after Dec 31, 2026 | – |
| Sprint Relay Triathlon | Sprint TriathlonSwim 750 m · Bike 12 mi · Run 3.1 miRelay or teamOpen water swim | Jun 5, 20277:30 AM | $216$232 after Dec 31, 2026 | – |
| Sprint Triathlon | Sprint TriathlonSwim 750 m · Bike 12 mi · Run 3.1 miOpen water swim | Jun 5, 20277:30 AM | $123$131 after Dec 31, 2026 | – |
| Super Sprint Triathlon (formerly Mini Sprint) | Super Sprint TriathlonSwim 400 m · Bike 12 mi · Run 1.5 miOpen water swim | Jun 5, 20277:30 AM | $123$131 after Dec 31, 2026 | – |
Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.
The Duathlon fee goes up to $131 on Dec 31, 2026.
Around June 5, Island Lake typically runs about 72°F at the surface (69 to 75°F across 2011 to 2020). Wetsuits were legal every year at this date.
A model estimate from the USGS lake temperature model (daily surface temperatures for US lakes), not a measurement. Wetsuit cutoffs are USA Triathlon age-group rules. The race's own water temperature reading on race morning decides.
Online registration closes Jun 5, 2027, unless the race fills first.
Sunrise on race morning is at about 5:58 AM, and the Olympic Aquabike starts at 7:30 AM. The start sits about 940 feet above sea level.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
6301 Kensington Rd., Brighton, MI 48116
The pin marks the address the race lists, which is usually the start. Course maps are the organizers' own.
National lists computed from results, entry fees, course maps and water temperatures; they refresh through the day.
Aggregated from official results (All Sports Events) for Epic Races' Island Lake Triathlon, Duathlon, Aquabike. Individual finisher names are not stored here.
At the 2025 Sprint, the fastest tenth finished in 1:27:09 or better, the top quarter in 1:34:46, and half the field in 1:44:11; the last tenth came in after 2:11:45.
At the 2025 Olympic, the fastest tenth finished in 2:30:39 or better, the top quarter in 2:43:07, and half the field in 3:00:19; the last tenth came in after 3:34:42.
At the 2025 Sprint Duathlon, the fastest tenth finished in 1:17:02 or better, the top quarter in 1:27:13, and half the field in 1:37:12; the last tenth came in after 2:00:13.
| Age | Women | Men |
|---|---|---|
| 20-29 | 1:35:50 | 1:26:15 |
| 30-39 | 1:34:27 | 1:27:24 |
| 40-49 | 1:35:06 | 1:21:29 |
| 50-59 | 1:47:38 | 1:26:50 |
| 60-69 | n/a | 1:34:53 |
| 70+ | n/a | 1:58:54 |
Groups with fewer than five finishers are left out. Awards vary by race; check the race's rules.
Where a finish time would have placed in 2025.
At the 2024 Sprint, the bike decided the most: the middle of the field lost about 7:51 to the top quarter there, 49% of the gap across the three legs.
Compared with a typical sprint triathlon in Michigan, the median swim here was 3:32 faster and the run 1:00 faster (swim lengths differ from race to race).
| Leg | Top 10% | Top 25% | Median | Slowest 25% |
|---|---|---|---|---|
| Swim | 11:41 | 13:01 | 15:08 | 17:15+ |
| T1 | 1:25 | 2:04 | 2:36 | 3:21+ |
| Bike | 36:04 | 39:43 | 44:40 | 48:45+ |
| T2 | 0:54 | 1:06 | 1:27 | 1:58+ |
| Run | 22:50 | 25:45 | 28:37 | 33:36+ |
Each column ranks finishers on that leg alone, from the race's published results. T1 and T2 are transitions.
At the 2024 Olympic, the bike decided the most: the middle of the field lost about 9:36 to the top quarter there, 44% of the gap across the three legs.
Compared with a typical olympic triathlon in Michigan, the median swim here was 3:58 faster, the bike 4:40 faster and the run 1:54 faster (swim lengths differ from race to race).
| Leg | Top 10% | Top 25% | Median | Slowest 25% |
|---|---|---|---|---|
| Swim | 23:18 | 25:16 | 27:21 | 31:02+ |
| T1 | 1:37 | 2:08 | 2:40 | 3:45+ |
| Bike | 1:09:45 | 1:13:27 | 1:20:12 | 1:25:39+ |
| T2 | 1:03 | 1:23 | 1:49 | 2:19+ |
| Run | 43:23 | 48:25 | 54:01 | 1:03:30+ |
Each column ranks finishers on that leg alone, from the race's published results. T1 and T2 are transitions.
Up 8 percent since 2022.
All events combined, from official results.
From 2022 to 2025, the field went from 127 to 169 finishers, and the median time rose from 1:32:49 to 1:44:11.
| Year | Finishers | Median | Fastest tenth | Winner |
|---|---|---|---|---|
| 2025 | 169 (+9%) | 1:44:11 | under 1:27:09 | 1:13:35 |
| 2024 | 155 (-9%) | 1:31:49 | under 1:15:50 | 1:03:44 |
| 2023 | 171 (+35%) | 1:33:58 | under 1:20:43 | 1:05:28 |
| 2022 | 127 | 1:32:49 | under 1:18:32 | 1:03:02 |
From each year's official results for the Sprint Triathlon; virtual options are left out.
Slower than most US sprint triathlons
The fastest quarter of the 2025 sprint triathlon field finished under 1:34:46, against 1:24:09 in a typical US sprint triathlon, so times here run 13 percent slower.
Compares the fastest quarter of each field, so walkers and first-timers do not skew it. It reflects the course and the field together: a flat course, cool weather, or a competitive crowd all make times faster.
Around June 5 the day usually runs from 56°F at dawn to 76°F in the afternoon, with measurable rain on about 27% of days. Cold snaps dip to 51°F and hot years reach 84°F.
Based on 60 days within a week of the date over the last 5 years, from historical weather for the start area. Not a forecast.
What the organizers of Epic Races' Island Lake Triathlon, Duathlon, Aquabike cover on their registration page, in brief.
Schedule and packet pickup
Please join us the Tuesday before race day at noon for our Pre-Race Athlete Briefing via Zoom. All you need to know for a successful race will be presented, followed by Q&A. We strongly suggest you attend. The Zoom link will be sent to all…
Schedule and packet pickup
5:45 - 7:00 A.M. PACKET PICK-UP AND RACE-DAY REGISTRATION TRANSITION AREA OPEN. 6:00 A.M. TRANSITION AREA OPEN. 7:15 A.M. TRANSITION AREA CLOSES. 7:20 A.M. MANDATORY MEETING ON THE BEACH. 7:30 A.M. ALL OLYMPIC ATHLETES + 1 Mile Open Water…
Course
Aid Stations will have water and Gatorade. Aid Station locations: Transition Area Swim In/Run Out. Run Course Mile 1.5 (Sprint and Olympic Only). Run Course Mile 4.5 (Olympic Only).
Course
Please note that in the interest of safety, all courses are subject to change at any time at the discretion of the race director. OLYMPIC BIKE COURSE. OLYMPIC RUN COURSE. SPRINT AND MINI SPRINT BIKE COURSE. SPRINT RUN COURSE. MINI SPRINT…
Parking and travel
Parking will be available! All vehicles that enter any Michigan state park will need a Recreation Passport. The Recreation Passport is your key to accessing state parks and recreation areas, boating access sites, state forest campgrounds…
Shirt and medal
All finishers receive a beautiful finisher's medal! Age Groups (Male/Female/Nonbinary Divisions). 14-15, 16-17, 18-19, 20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75-79, 80+. Olympic/Sprint/Mini-Sprint. 1st…
Organize this race? Add details or a correction
Triathletes throughout Michigan have long considered the Island Lake State Recreation Area, home of the Island Lake Triathlon, an epic training destination, ideal for any athlete preparing for a multisport event. Set within a 4,000-acre park in Livingston County that offers an “up north” experience without leaving southeast Michigan. The terrain is a mixture of open brush land to mature hardwood forest, with some pockets of open meadows mixed in with a paved road of rolling hills weaving throughout. You’ll swim the clear waters of Kent Lake, bike the park’s rolling, tree-lined hills, then run the panoramic final leg towards the lakeside finish line!
Island Lake Tri features 7 different events: