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| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| Aqua-Bike Half Iron Triathlon | AquabikeOpen water swim | Oct 9, 20277:45 AM | $205$240 after Dec 1, 2026 | – |
| Atomic Sprint Duathlon | Duathlon | Oct 9, 20277:45 AM | $79$110 after Dec 1, 2026 | – |
| Individual Half Iron Triathlon | Half Iron TriathlonOpen water swim | Oct 9, 20277:45 AM | $205$240 after Dec 1, 2026 | – |
| Relay Half Iron Triathlon | Half Iron TriathlonRelay or teamOpen water swim | Oct 9, 20277:45 AM | $270$300 after Dec 1, 2026 | – |
| Atomic Olympic Triathlon - Individual | Olympic TriathlonOpen water swim | Oct 9, 20278:15 AM | $109$130 after Dec 1, 2026 | – |
| Atomic Olympic Triathlon Relay | Olympic TriathlonRelay or teamOpen water swim | Oct 9, 20278:15 AM | $165$190 after Dec 1, 2026 | – |
| Olympic Aqua Bike | AquabikeOpen water swim | Oct 9, 20278:15 AM | $109$130 after Dec 1, 2026 | – |
| Atomic Sprint Triathlon - Individual | Sprint TriathlonOpen water swim | Oct 9, 20278:30 AM | $79$110 after Dec 1, 2026 | – |
| Atomic Sprint Triathlon Relay | Sprint TriathlonRelay or teamOpen water swim | Oct 9, 20278:30 AM | $129$150 after Dec 1, 2026 | – |
| Sprint Aqua Bike | AquabikeOpen water swim | Oct 9, 20278:30 AM | $79$110 after Dec 1, 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 $110 on Dec 1, 2026.
Around October 9, Melton Hill Lake typically runs about 76°F at the surface (73 to 80°F across 2011 to 2020). Wetsuits are usually legal, but in warmer years the water topped 78°F, when wearing one makes 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.
Online registration closes Oct 9, 2027, unless the race fills first.
Sunrise on race morning is at about 7:37 AM, and the Aqua-Bike Half Iron Triathlon starts at 7:45 AM. The start sits about 870 feet above sea level.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
1700 Melton Hill Dam Rd, Lenoir City, TN 37771
The pin marks the address the race lists, which is usually the start. Course maps are the organizers' own.
| Course | Distance | Climbing | Terrain |
|---|---|---|---|
| 2028.9 m Swimming Route in Lenoir City, TennesseeSwim | 2030 m |
From the course maps the organizers publish on Ride with GPS and MapMyRun; climbing is the total gain the map reports. Courses can change between editions, so check the date on the map.
National lists computed from results, entry fees, course maps and water temperatures; they refresh through the day.
Aggregated from official results (Personal Best Racing) for The Atomic Multisport Event by Personal Best Racing. Individual finisher names are not stored here.
At the 2026 Atomic Sprint Triathlon - Individual, the fastest tenth finished in 1:45:42 or better, the top quarter in 1:57:28, and half the field in 2:10:32; the last tenth came in after 2:47:55.
At the 2026 Atomic Olympic Triathlon - Individual, the fastest tenth finished in 2:34:27 or better, the top quarter in 2:43:11, and half the field in 3:00:20; the last tenth came in after 3:52:32.
At the 2026 Individual Half Iron Triathlon, the fastest tenth finished in 5:24:51 or better, the top quarter in 5:51:59, and half the field in 6:40:52; the last tenth came in after 8:02:09.
| Age | Women | Men |
|---|---|---|
| 20-29 | 2:00:22 | 1:48:15 |
| 30-39 | 2:13:18 | 1:57:19 |
| 40-49 | 2:06:42 | 1:54:33 |
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 2026.
At the 2026 Atomic Sprint Triathlon - Individual, the bike decided the most: the middle of the field lost about 15:10 to the top quarter there, 66% of the gap across the three legs.
Compared with a typical sprint triathlon in Tennessee, the median swim here was 4:39 slower, the bike 33:50 slower and the run 3:26 slower (swim lengths differ from race to race).
| Leg | Top 10% | Top 25% | Median | Slowest 25% |
|---|---|---|---|---|
| Swim | 10:56 | 12:14 | 15:02 | 17:30+ |
| T1 | 1:34 | 2:10 | 2:58 | 3:33+ |
| Bike | 1:04:58 | 1:11:30 | 1:20:19 | 1:35:58+ |
| T2 | 0:52 | 1:00 | 1:43 | 2:24+ |
| Run | 23:54 | 27:44 | 31:51 | 35:28+ |
Each column ranks finishers on that leg alone, from the race's published results. T1 and T2 are transitions.
At the 2026 Atomic Olympic Triathlon - Individual, the run decided the most: the middle of the field lost about 11:51 to the top quarter there, 43% of the gap across the three legs.
Compared with a typical olympic triathlon in Tennessee, the median swim here was 3:26 faster, the bike 2:13 faster and the run 5:17 faster (swim lengths differ from race to race).
| Leg | Top 10% | Top 25% | Median | Slowest 25% |
|---|---|---|---|---|
| Swim | 26:47 | 28:16 | 33:00 | 39:15+ |
| T1 | 0:37 | 1:00 | 1:56 | 2:43+ |
| Bike | 1:14:00 | 1:20:46 | 1:25:21 | 1:37:37+ |
| T2 | 0:31 | 0:46 | 1:27 | 2:25+ |
| Run | 46:32 | 50:20 | 56:13 | 1:04:44+ |
Each column ranks finishers on that leg alone, from the race's published results. T1 and T2 are transitions.
Down 13 percent since 2021.
All events combined, from official results.
From 2021 to 2026, the field went from 79 to 59 finishers, and the median time rose from 2:03:29 to 2:10:32.
| Year | Finishers | Median | Fastest tenth | Winner |
|---|---|---|---|---|
| 2026 | 59 (-45%) | 2:10:32 | under 1:45:42 | 1:22:04 |
| 2025 | 107 (+88%) | 2:05:39 | under 1:44:07 | 1:30:43 |
| 2023 | 57 (+10%) | 2:00:01 | under 1:32:53 | 1:20:23 |
| 2022 | 52 (-34%) | 1:59:54 | under 1:39:47 | 1:27:41 |
| 2021 | 79 | 2:03:29 | under 1:36:19 | 1:29:10 |
From each year's official results for the Sprint Triathlon; virtual options are left out.
Slower than most Tennessee sprint triathlons
The fastest quarter of the 2026 sprint triathlon field finished under 1:57:28, against 1:25:04 in a typical Tennessee sprint triathlon, so times here run 38 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 October 9 the day usually runs from 56°F at dawn to 76°F in the afternoon, with measurable rain on about 17% of days. Cold snaps dip to 47°F and hot years reach 81°F.
Based on 75 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 The Atomic Multisport Event by Personal Best Racing cover on their registration page, in brief.
Course
Half Iron Swim Course. Atomic by PBR Half Bike | 55.8 mi Running Route on Strava. Atomic by PBR Half Run | 13.1 mi Running Route on Strava. Sprint Swim. Sprint Bike. Sprint Run. Olympic Swim (2 Loops). Olympic Bike. Olympic Run (NEW).
Organize this race? Add details or a correction
This event is the season closer for PBR and we would love to have you wrap up your season with us!