Lake Montclair Triathlon & Duathlon
- Date
- Last held Jun 15, 2025, next date to be announced
- Location
- Montclair, Virginia
Registration for the next edition has not opened.
We earn a small commission when you register through this link, at no cost to you. Details
Official race websiteWater temperature and wetsuits at Lake Montclair Triathlon & Duathlon
Around June 15, Lake Montclair typically runs about 80°F at the surface (77 to 85°F across 2011 to 2020). The water usually runs above 78°F at this date: wetsuits are allowed but make you ineligible for age-group awards.
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.
Start location and course
4398 Spillway Lane Montclair, Montclair, VA 22025
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
Where Lake Montclair Triathlon & Duathlon ranks
- No. 19 of 50 on Largest duathlons in the US
National lists computed from results, entry fees, course maps and water temperatures; they refresh through the day.
2025 results
All resultsDuathlon
Triathlon
-Relay Duathlon
Aggregated from official results for Lake Montclair Triathlon & Duathlon. Individual finisher names are not stored here.
How fast do you need to be at Lake Montclair Triathlon & Duathlon?
At the 2025 Duathlon, the fastest tenth finished in 1:12:08 or better, the top quarter in 1:20:51, and half the field in 1:33:05; the last tenth came in after 1:57:15.
At the 2025 Triathlon, the fastest tenth finished in 1:04:18 or better, the top quarter in 1:11:14, and half the field in 1:19:53; the last tenth came in after 1:39:33.
At the 2025 -Relay Duathlon, the fastest tenth finished in 1:17:34 or better, the top quarter in 1:18:59, and half the field in 1:25:02; the last tenth came in after 1:40:49.
| Age | Women | Men |
|---|---|---|
| 20-29 | 1:21:35 | 1:38:40 |
| 30-39 | 1:33:18 | 1:15:43 |
| 40-49 | 1:36:19 | 1:10:26 |
| 50-59 | n/a | 1:15:28 |
Groups with fewer than five finishers are left out. Awards vary by race; check the race's rules.
What would my time get me?
Where a finish time would have placed in 2025.
Swim, bike and run splits at Lake Montclair Triathlon & Duathlon
At the 2025 Duathlon, the bike decided the most: the middle of the field lost about 8:25 to the top quarter there, 42% of the gap across the three legs.
Compared with a typical duathlon in Virginia, the median run 1 here was 1:55 slower, the bike 19:49 faster and the run 4:51 faster.
| Leg | Top 10% | Top 25% | Median | Slowest 25% |
|---|---|---|---|---|
| Run 1 | 10:33 | 11:14 | 13:17 | 15:08+ |
| T1 | 0:42 | 0:57 | 1:15 | 1:33+ |
| Bike | 37:12 | 40:59 | 46:43 | 54:45+ |
| T2 | 0:46 | 0:59 | 1:18 | 1:40+ |
| Run | 21:56 | 24:07 | 28:14 | 32:38+ |
Each column ranks finishers on that leg alone, from the race's published results. T1 and T2 are transitions.
At the 2025 Triathlon, the run decided the most: the middle of the field lost about 6:41 to the top quarter there, 50% of the gap across the three legs.
Compared with a typical sprint triathlon in Virginia, the median swim here was 15:23 faster (swim lengths differ from race to race).
| Leg | Top 10% | Top 25% | Median | Slowest 25% |
|---|---|---|---|---|
| Swim | 0:36 | 0:40 | 0:48 | 0:57+ |
| T1 | 0:35 | 0:43 | 0:57 | 1:11+ |
| Bike | 38:38 | 41:35 | 46:48 | 50:53+ |
| T2 | 0:36 | 0:53 | 1:14 | 1:42+ |
| Run | 23:46 | 25:16 | 29:31 | 32:52+ |
Each column ranks finishers on that leg alone, from the race's published results. T1 and T2 are transitions.
How fast is it?
About average for US duathlons
The fastest quarter of the 2025 duathlon field finished under 1:20:51, against 1:20:51 in a typical US duathlon, so times here are about average.
- Sprint Triathlon: Faster than most Virginia sprint triathlons. The fastest quarter of the 2025 sprint triathlon field finished under 1:11:14, against 1:24:35 in a typical Virginia sprint triathlon, so times here run 16 percent faster.
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.
Race details
- Where
- 4398 Spillway Lane Montclair, Montclair, VA 22025Map
- Course
- Road
- Distances
- Sprint Triathlon, Duathlon, Aquabike
- Editions
- 2025 (Jun 15, 2025), 2024 (Jun 23, 2024), 2023 (Jun 25, 2023)
- Status
- The next edition has not been announced yet. Past events: Aqua-Bike, Duathlon, -Relay Duathlon, Relay Triathlon, Triathlon.
Organize this race? Add details or a correction
Quick answers
- When is Lake Montclair Triathlon & Duathlon?
- The next date has not been announced.
- How much does it cost?
- See the registration page for current pricing.
- What distances are offered?
- Sprint Triathlon, Duathlon, Aquabike.
- How big is it, and how fast?
- In 2025, 73 athletes finished the Duathlon; the median finish was 1:33:05 and the winner finished in 1:00:58.
- Is it a fast course?
- The fastest quarter of the 2025 duathlon field finished under 1:20:51, against 1:20:51 in a typical US duathlon, so times here are about average.
- Where does it start?
- 4398 Spillway Lane Montclair, Montclair, VA 22025.
From the organizers
6/14/25, IMPORTANT RACE UPDATE - Swim Leg Cancelled. Click HERE to view info.
Enjoy one of Northern Virginia's oldest triathlons. Staged at Dolphin Beach, Lake Montclair is set in beautiful Northern Virginia. Participate in either the Sprint triathlon, duathlon or aquabike. This race is sanctioned by USA Triathlon. All information about this race can be found at https://www.ripitevents.com/lakemontclairtriathlon.
Triathlon - 750 Meter Swim | 12.5 Mile Bike | 3.1 Mile Run
Triathlon Relay - 750 Meter Swim | 12.5 Mile Bike | 3.1 Mile Run
Duathlon - 1.5 Mile Run | 12.5 Mile Bike | 3.1 Mile Run
AquaBike - 750 Meter Swim | 12.5 Mile Bike