23 October 2026 · Courses · 70.3
The fastest and slowest IRONMAN 70.3 courses, measured on the same athletes
Everyone says Nice is slow and Erkner is fast. We measured it: 50,000 athletes who raced two or more 70.3 courses since 2024, compared against themselves. The spread between the fastest and slowest course is 66 minutes.
Ask anyone who has raced both and they will tell you Nice is slow and Erkner is fast. Ask them how much, and they will guess. Median finish times do not answer it either: Augusta's median is 6:12 and Venice-Jesolo's is 5:22, but that says more about who shows up than about the roads.
So we did what marathon statisticians do when they compare Boston with Berlin. We took every IRONMAN 70.3 since June 2024 — 305 editions, 132 distinct courses — found the 50,361 athletes who finished two or more different courses, and compared each of them against themselves. If you went 5:10 in Warsaw and 5:40 in Nice, that 30 minutes is information about Nice and Warsaw, not about you. Do that fifty thousand times and the courses separate.
How to read the numbers
Each course gets an effect relative to the average 70.3: how much slower or faster the same athlete goes there. We show it as a percentage and as minutes for an athlete whose average-course time is 5:00. The swim, bike and run columns are the same model run on each leg separately, so you can see where a course takes its time.
Two numbers are shown for context only. "Median finish" is the plain median of all finishers, the figure everyone quotes, and it is there to show how misleading it is. "Non-finish" is the share of starters who did not reach the line.
The fastest 15
| Course | vs average | For a 5:00 athlete | Swim | Bike | Run | Repeat athletes | Median finish | Non-finish |
|---|---|---|---|---|---|---|---|---|
| Erkner | -7.6% | -23 min | -10.0% | -7.6% | -8.0% | 1,715 | 5:25:25 | 6% |
| Leipzig | -6.8% | -20 min | -3.6% | -7.6% | -7.8% | 756 | 5:24:53 | 4% |
| Monterrey | -6.3% | -19 min | -1.4% | -8.8% | -2.9% | 1,267 | 5:49:49 | 16% |
| Tours Metropole - Loire Valley | -6.1% | -18 min | -1.4% | -10.3% | -5.0% | 1,111 | 5:27:35 | 3% |
| Türkiye | -6.0% | -18 min | -0.5% | -8.7% | -4.4% | 1,077 | 5:26:55 | 19% |
| Augusta | -5.8% | -17 min | -24.6% | -3.4% | -4.0% | 731 | 6:12:00 | 6% |
| Florianopolis | -5.6% | -17 min | -9.4% | -5.0% | -4.2% | 1,237 | 5:29:28 | 17% |
| Warsaw | -5.6% | -17 min | -2.1% | -8.7% | -2.6% | 2,421 | 5:24:22 | 15% |
| North Carolina | -5.6% | -17 min | -16.7% | -3.4% | -7.0% | 2,495 | 6:06:48 | 8% |
| Venice-Jesolo | -5.5% | -17 min | -2.8% | -6.4% | -7.0% | 2,402 | 5:22:29 | 4% |
| Texas | -5.0% | -15 min | -1.3% | -5.5% | -3.5% | 584 | 6:06:19 | 6% |
| Agadir | -4.9% | -15 min | -11.1% | -3.2% | -3.3% | 193 | 5:30:07 | 12% |
| Michigan | -4.6% | -14 min | +0.9% | -6.5% | -2.7% | 1,782 | 6:01:48 | 8% |
| Poznan | -4.6% | -14 min | -0.7% | -5.5% | -4.8% | 1,317 | 5:35:00 | 15% |
| San Juan | -4.5% | -13 min | +4.4% | -7.7% | -1.7% | 1,104 | 5:23:21 | 7% |
Erkner, Leipzig and Tours are what a fast course looks like: flat bike, flat run, cool air, and the effect spread evenly across all three legs. Monterrey and Türkiye are fast for a different reason: the bike. Both give back 9 percent on the bike alone.
Augusta and North Carolina are the interesting ones. Their medians are over six hours, among the slowest in the table, yet the same athlete goes 17 minutes faster there than on an average course. The swim column explains it: minus 25 and minus 17 percent, river swims with the current. The field is slow; the course is quick.
The slowest 15
| Course | vs average | For a 5:00 athlete | Swim | Bike | Run | Repeat athletes | Median finish | Non-finish |
|---|---|---|---|---|---|---|---|---|
| Nice | +14.2% | +43 min | +2.3% | +24.5% | +0.9% | 1,471 | 6:25:14 | 9% |
| Marbella | +13.5% | +41 min | +34.0% | +20.0% | -1.8% | 701 | 6:18:59 | 8% |
| Rwanda | +11.7% | +35 min | +5.1% | +14.7% | +12.4% | 54 | 6:41:20 | 24% |
| San Salvador | +9.2% | +28 min | +6.1% | +15.0% | +5.6% | 166 | 6:52:48 | 24% |
| Hawaii | +8.2% | +25 min | +4.8% | +7.8% | +9.7% | 850 | 6:43:53 | 24% |
| Los Cabos | +7.8% | +23 min | +12.6% | +8.0% | +8.2% | 380 | 6:18:45 | 21% |
| Subic Bay | +7.6% | +23 min | -2.8% | +6.8% | +13.8% | 496 | 6:46:48 | 17% |
| Puerto Princesa | +7.3% | +22 min | +9.1% | +2.6% | +15.2% | 187 | 6:26:01 | 16% |
| St. George | +6.7% | +20 min | +0.5% | +8.7% | +6.7% | 977 | 6:23:55 | 13% |
| Rockford | +6.6% | +20 min | -10.3% | +5.3% | +13.8% | 834 | 6:41:48 | 20% |
| Swansea | +6.4% | +19 min | -4.7% | +12.2% | -0.1% | 1,122 | 6:16:46 | 7% |
| Mossel Bay | +6.2% | +19 min | +0.7% | +11.6% | +0.3% | 1,035 | 6:36:22 | 19% |
| Acapulco | +5.8% | +17 min | +4.1% | +6.3% | +8.4% | 447 | 6:18:57 | 27% |
| Pennsylvania Happy Valley | +5.8% | +17 min | +4.4% | +10.6% | +0.4% | 1,432 | 6:28:51 | 11% |
| Goa | +5.2% | +16 min | -1.5% | +3.5% | +9.9% | 199 | 7:16:47 | 26% |
Nice is the slowest 70.3 in the world by a distance, and it is entirely the bike: plus 24 percent on the climb to the Col de Vence and back, with the swim and run close to average. Marbella is the same story with a hard sea swim on top. For a 5:00 athlete, Nice costs 43 minutes and Erkner gives back 23, so the spread between the two ends of the table is 66 minutes for the same person.
Below the mountain courses the pattern changes. Hawaii, Subic Bay, Puerto Princesa, Los Cabos and San Salvador are not hilly; they are hot. Their time goes on the run, 8 to 15 percent, and it shows in the non-finish column too: a quarter of starters in Hawaii and Acapulco do not finish, against 4 to 6 percent in Leipzig, Venice or Tours.
Where the time goes
The bike decides the course. The four biggest bike penalties — Nice, Marbella, San Salvador, Rwanda — are the four slowest courses overall, and Swansea and Alcúdia-Mallorca, next on the bike, are both in the slowest 20. On the fast end, Tours, Monterrey, Warsaw and Türkiye all gain 9 to 10 percent on the bike. The bike is half the race, and it is the leg where terrain can move the time by a quarter.
Heat shows on the run. Every course with a run penalty above 10 percent is in a hot climate: Puerto Princesa, Subic Bay, Rockford in June, Desaru Coast, Rwanda, Cozumel. The bike on those courses is often average or even fast. If you are choosing a race for a personal best, a flat course in a hot place is not a fast course.
The swim is where the medians lie. Augusta, North Carolina, Erkner, Florianopolis and Agadir all gain 9 to 25 percent on the swim: current, a lake with no chop, or a short course in practice. A 20-minute swim does wonders for the median and tells you nothing about the bike and run.
What this is not
It is not a ranking of race quality, and it is not a prediction for one particular day. Each course pools its editions since 2024, so a venue with a windy year and a calm year gets the average of both. Editions where the swim was shortened or cancelled are excluded, 44 of them, as is any course with fewer than 40 repeat athletes. Only finishers count, which makes the hardest courses look slightly easier than they are: the people who quit in the heat are not in the comparison.
The model is simple on purpose: the log of each finish time is an athlete term plus a course term, fitted by alternating means until it stops moving. Athlete fitness changing between races averages out across fifty thousand people; it does not bias one course unless its field systematically races it at a different point in the season, which is a real effect for early-season and late-season races and part of what "fast" means in practice.
All 132 courses
Every course with at least 40 repeat athletes, fastest first
| Course | vs average | For a 5:00 athlete | Swim | Bike | Run | Repeat athletes | Median finish | Non-finish |
|---|---|---|---|---|---|---|---|---|
| Erkner | -7.6% | -23 min | -10.0% | -7.6% | -8.0% | 1,715 | 5:25:25 | 6% |
| Leipzig | -6.8% | -20 min | -3.6% | -7.6% | -7.8% | 756 | 5:24:53 | 4% |
| Monterrey | -6.3% | -19 min | -1.4% | -8.8% | -2.9% | 1,267 | 5:49:49 | 16% |
| Tours Metropole - Loire Valley | -6.1% | -18 min | -1.4% | -10.3% | -5.0% | 1,111 | 5:27:35 | 3% |
| Türkiye | -6.0% | -18 min | -0.5% | -8.7% | -4.4% | 1,077 | 5:26:55 | 19% |
| Augusta | -5.8% | -17 min | -24.6% | -3.4% | -4.0% | 731 | 6:12:00 | 6% |
| Florianopolis | -5.6% | -17 min | -9.4% | -5.0% | -4.2% | 1,237 | 5:29:28 | 17% |
| Warsaw | -5.6% | -17 min | -2.1% | -8.7% | -2.6% | 2,421 | 5:24:22 | 15% |
| North Carolina | -5.6% | -17 min | -16.7% | -3.4% | -7.0% | 2,495 | 6:06:48 | 8% |
| Venice-Jesolo | -5.5% | -17 min | -2.8% | -6.4% | -7.0% | 2,402 | 5:22:29 | 4% |
| Texas | -5.0% | -15 min | -1.3% | -5.5% | -3.5% | 584 | 6:06:19 | 6% |
| Agadir | -4.9% | -15 min | -11.1% | -3.2% | -3.3% | 193 | 5:30:07 | 12% |
| Michigan | -4.6% | -14 min | +0.9% | -6.5% | -2.7% | 1,782 | 6:01:48 | 8% |
| Poznan | -4.6% | -14 min | -0.7% | -5.5% | -4.8% | 1,317 | 5:35:00 | 15% |
| San Juan | -4.5% | -13 min | +4.4% | -7.7% | -1.7% | 1,104 | 5:23:21 | 7% |
| Western Sydney | -4.4% | -13 min | +0.2% | -3.8% | -4.4% | 1,043 | 5:38:33 | 14% |
| Bahrain | -4.4% | -13 min | +3.6% | -3.8% | -7.7% | 561 | 5:40:21 | 18% |
| Valdivia | -4.3% | -13 min | -11.7% | -6.2% | -3.3% | 1,320 | 5:35:22 | 20% |
| Buenos Aires | -4.3% | -13 min | +2.6% | -5.2% | -5.5% | 1,758 | 5:26:06 | 11% |
| Melbourne | -4.3% | -13 min | -4.6% | -4.4% | -4.1% | 573 | 5:28:28 | 16% |
| Belgrade | -4.1% | -12 min | -4.4% | -3.9% | -5.3% | 796 | 5:40:51 | 23% |
| Duisburg | -3.9% | -12 min | +0.3% | -7.4% | -1.9% | 2,045 | 5:34:26 | 5% |
| New York | -3.9% | -12 min | +4.6% | -4.1% | -5.1% | 1,594 | 6:07:11 | 10% |
| Ohio | -3.8% | -11 min | +7.4% | -6.7% | -1.3% | 1,022 | 6:05:51 | 9% |
| Eagleman | -3.7% | -11 min | +5.2% | -7.0% | -1.8% | 2,266 | 6:08:20 | 7% |
| Western Massachusetts | -3.5% | -11 min | -11.8% | +0.4% | -7.8% | 468 | 5:50:52 | 6% |
| Elsinore | -3.5% | -10 min | -1.2% | -3.8% | -5.2% | 1,254 | 5:33:35 | 5% |
| Brasilia | -3.3% | -10 min | +1.1% | -5.9% | +1.8% | 1,580 | 5:24:41 | 13% |
| Sunshine Coast | -3.2% | -10 min | +1.5% | -3.0% | -3.2% | 1,296 | 5:38:43 | 19% |
| Geelong | -3.2% | -10 min | -8.3% | -1.9% | -3.1% | 972 | 5:30:32 | 11% |
| Les Sables d'Olonne - Vendée | -3.0% | -9 min | -12.5% | -0.5% | -5.3% | 1,734 | 5:37:22 | 4% |
| Des Moines | -3.0% | -9 min | +1.1% | -1.9% | -4.1% | 1,060 | 6:00:34 | 6% |
| Alghero | -2.8% | -8 min | -4.0% | -3.8% | -1.8% | 1,088 | 5:32:52 | 5% |
| Western Australia | -2.8% | -8 min | +4.6% | -4.5% | -2.9% | 472 | 5:51:29 | 17% |
| Shanghai Chongming | -2.8% | -8 min | +6.1% | -7.2% | +1.8% | 712 | 5:55:03 | 14% |
| Peru | -2.7% | -8 min | +1.1% | -3.5% | -2.0% | 734 | 5:52:04 | 9% |
| Westfriesland | -2.5% | -8 min | +2.1% | -3.4% | -2.5% | 1,735 | 5:39:36 | 5% |
| Porec | -2.5% | -7 min | -5.1% | -1.0% | -3.9% | 1,793 | 5:34:48 | 16% |
| Knokke-Heist | -2.4% | -7 min | -1.9% | -2.3% | -3.6% | 1,789 | 5:35:53 | 4% |
| Dali | -2.4% | -7 min | -1.5% | -9.6% | +5.3% | 363 | 6:09:17 | 13% |
| La Quinta | -2.2% | -6 min | +4.6% | -5.2% | -1.6% | 1,894 | 6:07:13 | 9% |
| Da Nang | -2.0% | -6 min | -5.3% | -6.7% | +6.5% | 914 | 6:28:38 | 14% |
| Punta del Este | -2.0% | -6 min | -7.0% | +2.4% | -4.8% | 1,150 | 5:37:33 | 9% |
| Muscat | -1.9% | -6 min | -5.2% | -0.1% | -3.1% | 475 | 5:36:48 | 18% |
| Hradec Králové | -1.8% | -6 min | -4.1% | -3.7% | +0.6% | 1,171 | 5:39:26 | 12% |
| Santa Cruz | -1.8% | -5 min | -4.4% | -1.7% | -2.0% | 2,149 | 6:07:12 | 7% |
| Krakow | -1.8% | -5 min | -6.1% | -1.6% | -1.8% | 1,322 | 5:42:37 | 12% |
| Baku | -1.7% | -5 min | +0.2% | -2.4% | +0.7% | 266 | 5:50:52 | 19% |
| Gdynia | -1.7% | -5 min | +2.2% | +0.5% | -4.9% | 817 | 5:39:26 | 15% |
| Valencia | -1.7% | -5 min | -0.6% | -0.4% | -5.5% | 1,799 | 5:36:40 | 6% |
| Oman | -1.6% | -5 min | -3.0% | +0.0% | -2.6% | 453 | 5:39:42 | 22% |
| Goseong | -1.5% | -5 min | -0.3% | -1.2% | +1.3% | 247 | 6:14:43 | 13% |
| Calgary | -1.5% | -4 min | +3.9% | -3.2% | +0.8% | 484 | 6:00:44 | 15% |
| Italy Emilia Romagna | -1.3% | -4 min | -7.7% | -3.0% | -0.1% | 2,641 | 5:46:14 | 7% |
| Jönköping | -1.2% | -4 min | +2.0% | -1.3% | -4.5% | 1,028 | 5:50:05 | 5% |
| Málaga | -1.1% | -3 min | -2.0% | -2.7% | -4.6% | 913 | 5:46:53 | 10% |
| Puerto Rico | -0.8% | -2 min | +0.0% | -5.1% | +5.4% | 569 | 6:14:02 | 19% |
| Wisconsin | -0.6% | -2 min | +1.3% | +0.9% | -4.2% | 1,385 | 6:20:12 | 9% |
| Durban | -0.6% | -2 min | -1.3% | +0.5% | -1.9% | 1,264 | 6:14:44 | 15% |
| Tallinn | -0.6% | -2 min | +0.1% | +0.4% | -2.9% | 1,135 | 5:52:44 | 16% |
| Musselman | -0.5% | -2 min | +8.6% | -2.7% | +2.1% | 1,890 | 6:11:08 | 10% |
| Muncie | -0.5% | -2 min | +11.5% | -5.7% | +4.3% | 1,123 | 6:08:41 | 9% |
| Florida | -0.5% | -1 min | +7.7% | -2.9% | +0.2% | 1,288 | 6:09:04 | 11% |
| Louisville | -0.4% | -1 min | -2.3% | -2.6% | +2.3% | 1,185 | 6:25:23 | 11% |
| Sao Paulo | -0.3% | -1 min | -0.1% | -0.6% | +0.7% | 1,756 | 5:44:50 | 15% |
| Sharm El-Sheikh, Egypt | -0.3% | -1 min | +2.2% | +1.0% | -2.3% | 138 | 6:15:02 | 23% |
| Hengqin | -0.2% | -1 min | +6.8% | -3.1% | +1.2% | 489 | 6:13:25 | 16% |
| Versailles | -0.1% | -0 min | -13.3% | +2.2% | -5.1% | 576 | 5:47:38 | 4% |
| Encarnacion | -0.0% | -0 min | -2.2% | +5.8% | -4.8% | 353 | 5:46:55 | 16% |
| Aracaju-Sergipe | +0.0% | +0 min | +1.8% | -1.3% | +4.3% | 942 | 5:43:32 | 15% |
| Vitoria-Gasteiz | +0.1% | +0 min | +9.9% | -2.7% | +0.6% | 352 | 5:47:38 | 9% |
| Cozumel | +0.1% | +0 min | -9.3% | -5.0% | +11.1% | 1,817 | 6:14:25 | 21% |
| Costa Navarino, Peloponnese, Greece | +0.1% | +0 min | -7.4% | +2.8% | -0.2% | 282 | 5:50:56 | 15% |
| Chattanooga | +0.2% | +1 min | +4.5% | -3.2% | +3.4% | 1,068 | 6:21:44 | 9% |
| New Zealand | +0.2% | +1 min | +1.9% | +3.0% | -4.5% | 348 | 6:02:24 | 12% |
| Boise | +0.2% | +1 min | +14.6% | -1.8% | -1.2% | 495 | 6:18:48 | 13% |
| Cairns | +0.3% | +1 min | -3.4% | +2.5% | -1.1% | 1,274 | 5:53:53 | 16% |
| Port Macquarie | +0.4% | +1 min | -3.3% | +5.8% | -4.6% | 289 | 6:06:54 | 17% |
| Mont Tremblant | +0.4% | +1 min | -1.9% | +3.2% | -1.3% | 1,180 | 5:59:55 | 7% |
| Cap Cana | +0.5% | +2 min | +5.3% | -3.3% | +6.3% | 653 | 6:01:39 | 11% |
| Ecuador | +0.6% | +2 min | +3.8% | +1.0% | +1.3% | 212 | 6:07:14 | 10% |
| Boulder | +0.8% | +2 min | +5.8% | -3.4% | +6.1% | 1,559 | 6:13:49 | 9% |
| Lahti | +0.8% | +2 min | +11.4% | +1.6% | -2.3% | 216 | 5:45:24 | 9% |
| Bolton | +0.8% | +3 min | -1.1% | +5.5% | -6.1% | 950 | 6:02:53 | 7% |
| Riviera Nayarit | +0.9% | +3 min | -3.2% | -0.3% | +6.1% | 746 | 6:09:25 | 22% |
| Pucon | +1.0% | +3 min | +3.0% | -0.8% | +2.4% | 1,336 | 5:51:37 | 8% |
| Northern California | +1.1% | +3 min | +18.3% | -0.0% | -0.8% | 374 | 6:26:30 | 14% |
| Cartagena | +1.2% | +4 min | +0.2% | -1.6% | +6.3% | 972 | 6:08:37 | 11% |
| Cascais Portugal | +1.3% | +4 min | +2.5% | +2.0% | -1.7% | 2,013 | 5:54:18 | 7% |
| Ruidoso New Mexico | +1.4% | +4 min | +5.2% | -3.6% | +7.0% | 300 | 6:25:45 | 15% |
| Davao | +1.5% | +5 min | +9.5% | -2.3% | +5.7% | 417 | 6:20:46 | 16% |
| Coeur d'Alene | +1.5% | +5 min | +4.0% | +6.1% | -4.8% | 682 | 6:17:19 | 9% |
| Salalah | +1.6% | +5 min | +1.3% | -0.8% | +7.3% | 267 | 5:49:14 | 27% |
| Phu Quoc | +1.7% | +5 min | +1.1% | -1.7% | +8.2% | 622 | 6:27:58 | 20% |
| Fortaleza | +1.7% | +5 min | +2.7% | +3.3% | +2.3% | 387 | 5:35:35 | 11% |
| Victoria | +1.8% | +5 min | -0.7% | +5.8% | -1.4% | 347 | 6:15:22 | 7% |
| Muskoka | +1.8% | +5 min | +3.8% | +1.3% | +3.6% | 891 | 6:15:57 | 18% |
| Luxembourg | +2.0% | +6 min | -0.2% | +3.1% | -2.4% | 1,955 | 5:45:14 | 6% |
| Barranquilla | +2.0% | +6 min | +3.1% | +1.6% | +5.5% | 362 | 6:05:20 | 11% |
| Oceanside | +2.2% | +7 min | -0.1% | +5.4% | -3.0% | 2,195 | 6:11:58 | 14% |
| Switzerland | +2.2% | +7 min | -1.7% | +5.6% | -0.7% | 1,236 | 5:42:55 | 6% |
| Campeche | +2.5% | +7 min | -2.6% | +1.5% | +7.4% | 212 | 6:03:10 | 24% |
| Rio de Janeiro | +2.5% | +8 min | +2.9% | +2.0% | +1.7% | 1,265 | 5:56:53 | 19% |
| Tangier | +2.8% | +8 min | +1.1% | +9.6% | -5.6% | 229 | 5:32:05 | 17% |
| Aix-en-Provence | +2.8% | +8 min | +0.2% | +7.2% | -5.2% | 1,424 | 5:49:32 | 4% |
| Weymouth | +2.9% | +9 min | -1.6% | +6.7% | -2.9% | 765 | 6:08:51 | 6% |
| Kraichgau | +3.2% | +10 min | -1.8% | +8.8% | -5.0% | 1,686 | 5:38:05 | 6% |
| Omaha | +3.2% | +10 min | +2.7% | +3.4% | +4.7% | 546 | 6:33:16 | 12% |
| Waco | +3.3% | +10 min | +6.9% | -0.9% | +7.8% | 1,159 | 6:37:28 | 15% |
| Kenting | +3.4% | +10 min | +2.0% | -1.3% | +9.8% | 87 | 6:45:10 | 25% |
| Lapu-Lapu | +3.5% | +10 min | -13.7% | +3.7% | +8.6% | 583 | 6:22:10 | 21% |
| Curitiba | +4.0% | +12 min | +0.2% | +7.0% | +3.7% | 602 | 5:52:50 | 9% |
| Vichy | +4.1% | +12 min | +6.7% | +9.5% | -4.9% | 1,733 | 5:54:32 | 4% |
| Alcúdia-Mallorca | +4.1% | +12 min | -6.0% | +11.6% | -4.5% | 2,320 | 5:56:14 | 6% |
| Zell am See-Kaprun | +5.0% | +15 min | +0.0% | +7.9% | +1.7% | 2,066 | 5:57:05 | 6% |
| Langkawi | +5.1% | +15 min | -1.9% | +4.9% | +10.0% | 372 | 6:41:02 | 18% |
| Desaru Coast | +5.1% | +15 min | +10.2% | +0.6% | +13.0% | 176 | 6:38:49 | 19% |
| Goa | +5.2% | +16 min | -1.5% | +3.5% | +9.9% | 199 | 7:16:47 | 26% |
| Pennsylvania Happy Valley | +5.8% | +17 min | +4.4% | +10.6% | +0.4% | 1,432 | 6:28:51 | 11% |
| Acapulco | +5.8% | +17 min | +4.1% | +6.3% | +8.4% | 447 | 6:18:57 | 27% |
| Mossel Bay | +6.2% | +19 min | +0.7% | +11.6% | +0.3% | 1,035 | 6:36:22 | 19% |
| Swansea | +6.4% | +19 min | -4.7% | +12.2% | -0.1% | 1,122 | 6:16:46 | 7% |
| Rockford | +6.6% | +20 min | -10.3% | +5.3% | +13.8% | 834 | 6:41:48 | 20% |
| St. George | +6.7% | +20 min | +0.5% | +8.7% | +6.7% | 977 | 6:23:55 | 13% |
| Puerto Princesa | +7.3% | +22 min | +9.1% | +2.6% | +15.2% | 187 | 6:26:01 | 16% |
| Subic Bay | +7.6% | +23 min | -2.8% | +6.8% | +13.8% | 496 | 6:46:48 | 17% |
| Los Cabos | +7.8% | +23 min | +12.6% | +8.0% | +8.2% | 380 | 6:18:45 | 21% |
| Hawaii | +8.2% | +25 min | +4.8% | +7.8% | +9.7% | 850 | 6:43:53 | 24% |
| San Salvador | +9.2% | +28 min | +6.1% | +15.0% | +5.6% | 166 | 6:52:48 | 24% |
| Rwanda | +11.7% | +35 min | +5.1% | +14.7% | +12.4% | 54 | 6:41:20 | 24% |
| Marbella | +13.5% | +41 min | +34.0% | +20.0% | -1.8% | 701 | 6:18:59 | 8% |
| Nice | +14.2% | +43 min | +2.3% | +24.5% | +0.9% | 1,471 | 6:25:14 | 9% |
Method and sources
Results are the official IRONMAN results for every 70.3 event dated 1 June 2024 or later, 305 editions in total, matched across races by IRONMAN's own athlete identifier. Relay, professional and open-division entries are excluded, as are duathlon and bike-run editions and editions whose median swim time was more than 25 percent off the global median. Course names are pooled across editions and across renamings (Erkner and Erkner Berlin-Brandenburg are one course; so are Turkey and Türkiye). The World Championship editions are excluded from the ranking because their field is not comparable, though for the record the 2024 and 2025 championship courses would sit between Hawaii and Marbella.