Difficulty
Which IRONMAN is hardest?
We compare the same athletes across different races to measure how fast or slow each course is relative to the average for its distance, overall and for swim, bike and run. 0% is average; positive means slower.
IRONMAN
| Race | Total | Swim | Bike | Run | Athletes |
|---|---|---|---|---|---|
| IRONMAN California | −5.2% | −24.2% | −4.9% | −0.9% | 1289 |
| IRONMAN Maryland | −5.2% | +11.3% | −10.7% | −2.4% | 1119 |
| IRONMAN Brasil Florianópolis | −4.4% | +0.4% | −3.4% | −5.9% | 1112 |
| IRONMAN Canada-Ottawa | −2.9% | +9.9% | −5.7% | −1.4% | 1142 |
| IRONMAN Florida | −2.3% | +6.4% | −4.7% | −1.4% | 1716 |
| IRONMAN Chattanooga | −2.0% | −24.6% | −0.2% | +2.6% | 870 |
| IRONMAN Arizona | −1.8% | +8.8% | −2.9% | −2.4% | 1615 |
| IRONMAN Jacksonville | −0.4% | −12.4% | −2.1% | +4.5% | 568 |
| IRONMAN Cozumel | +0.5% | −3.3% | +0.8% | +2.0% | 966 |
| IRONMAN Texas | +0.7% | +12.9% | −2.8% | +1.8% | 2440 |
| IRONMAN Wisconsin | +3.0% | +6.5% | +6.0% | −1.5% | 1107 |
| IRONMAN Lake Placid | +3.9% | +4.2% | +8.4% | −1.1% | 2080 |
| IRONMAN World Championship Kona | +5.2% | +9.2% | +4.5% | +5.3% | 3325 |
| IRONMAN World Championship Nice | +12.2% | +6.2% | +21.6% | +1.4% | 2366 |
IRONMAN 70.3
| Race | Total | Swim | Bike | Run | Athletes |
|---|---|---|---|---|---|
| IRONMAN 70.3 Calgary | −7.5% | +3.2% | −14.5% | −1.5% | 608 |
| IRONMAN 70.3 North Carolina | −5.8% | −18.6% | −3.0% | −7.5% | 3078 |
| IRONMAN 70.3 Monterrey | −5.4% | −0.5% | −7.4% | −3.0% | 1774 |
| IRONMAN 70.3 Michigan | −4.6% | +0.9% | −5.9% | −3.6% | 1872 |
| IRONMAN 70.3 Valdivia | −4.4% | −12.4% | −5.3% | −4.6% | 1480 |
| IRONMAN 70.3 Buenos Aires | −4.3% | +1.8% | −4.7% | −6.1% | 2099 |
| IRONMAN 70.3 Florianópolis | −4.2% | −9.0% | −4.1% | −2.1% | 1455 |
| IRONMAN 70.3 Texas | −4.0% | +0.6% | −4.9% | −2.4% | 1328 |
| IRONMAN 70.3 New York | −4.0% | +4.6% | −4.0% | −5.6% | 1679 |
| IRONMAN 70.3 Ohio | −3.9% | +6.9% | −6.5% | −2.4% | 1039 |
| IRONMAN 70.3 San Juan | −3.9% | +4.6% | −7.0% | −1.5% | 1382 |
| IRONMAN 70.3 Eagleman | −3.6% | +5.5% | −6.6% | −2.2% | 2443 |
| IRONMAN 70.3 Brasilia | −3.5% | +0.0% | −5.9% | +0.5% | 1663 |
| IRONMAN 70.3 Augusta | −3.4% | −25.4% | −1.6% | −0.3% | 2621 |
| IRONMAN 70.3 Gulf Coast | −3.3% | +6.9% | −4.6% | −4.4% | 702 |
| IRONMAN 70.3 Western Massachusetts | −3.3% | −11.5% | +0.6% | −7.9% | 533 |
| IRONMAN 70.3 Peru | −2.8% | −0.2% | −2.9% | −3.0% | 1329 |
| IRONMAN 70.3 La Quinta | −1.8% | +3.6% | −4.1% | −2.4% | 2838 |
| IRONMAN 70.3 Punta del Este | −1.8% | −5.4% | +2.6% | −5.6% | 1391 |
| IRONMAN 70.3 Santa Cruz | −1.7% | −4.3% | −1.1% | −2.8% | 2187 |
| IRONMAN 70.3 Boise | −1.6% | +7.3% | −0.1% | −5.5% | 674 |
| IRONMAN 70.3 São Paulo | −1.3% | −1.8% | −1.0% | −1.4% | 1697 |
| IRONMAN 70.3 Maine | −1.1% | −26.9% | +3.4% | +0.2% | 775 |
| IRONMAN 70.3 Aracaju-Sergipe | −1.0% | +1.0% | −2.0% | +2.5% | 966 |
| IRONMAN 70.3 Chattanooga | −0.7% | −3.2% | −2.3% | +1.7% | 2752 |
| IRONMAN 70.3 Musselman | −0.6% | +7.8% | −2.4% | +1.1% | 1933 |
| IRONMAN 70.3 Wisconsin | −0.5% | +1.2% | +1.6% | −4.9% | 1429 |
| IRONMAN 70.3 Florida | −0.4% | +6.8% | −2.3% | −0.4% | 2127 |
| IRONMAN 70.3 Muncie | −0.4% | +10.9% | −5.1% | +3.1% | 1086 |
| IRONMAN 70.3 Louisville | −0.1% | −3.2% | −1.9% | +1.8% | 1365 |
| IRONMAN 70.3 Cozumel | −0.0% | −8.9% | −4.5% | +9.3% | 1937 |
| IRONMAN 70.3 Encarnación | +0.1% | −0.2% | +5.6% | −5.3% | 240 |
| IRONMAN 70.3 Mont-Tremblant | +0.1% | −2.1% | +3.3% | −2.5% | 1624 |
| IRONMAN 70.3 Puerto Rico | +0.3% | −0.3% | −3.7% | +6.2% | 899 |
| IRONMAN 70.3 Boulder | +0.5% | +5.3% | −3.0% | +4.5% | 1711 |
| IRONMAN 70.3 Cap Cana | +1.0% | +3.6% | −2.2% | +5.5% | 1039 |
| IRONMAN 70.3 Northern California | +1.3% | +15.8% | +0.7% | −1.5% | 429 |
| IRONMAN 70.3 Muskoka | +1.5% | +3.2% | +1.4% | +2.7% | 1086 |
| IRONMAN 70.3 Ecuador | +1.5% | +10.4% | +1.2% | +0.3% | 650 |
| IRONMAN 70.3 Pucón | +1.6% | +2.7% | +0.7% | +0.8% | 1639 |
| IRONMAN 70.3 Ruidoso New Mexico | +1.7% | +4.7% | −3.0% | +6.5% | 322 |
| IRONMAN 70.3 Coeur d'Alene | +1.8% | +3.4% | +7.1% | −5.5% | 741 |
| IRONMAN 70.3 Rio de Janeiro | +1.9% | +1.4% | +1.8% | +0.2% | 1271 |
| IRONMAN 70.3 Barranquilla | +2.1% | +3.1% | +2.5% | +4.9% | 401 |
| IRONMAN 70.3 Cartagena | +2.2% | +1.6% | −0.3% | +6.5% | 1782 |
| IRONMAN 70.3 Campeche | +2.2% | −3.5% | +3.0% | +5.0% | 895 |
| IRONMAN 70.3 Waco | +2.9% | +6.5% | −0.9% | +6.2% | 1400 |
| IRONMAN 70.3 Omaha | +3.3% | +2.8% | +4.3% | +3.4% | 419 |
| IRONMAN 70.3 Curitiba | +3.3% | −1.3% | +6.3% | +2.2% | 642 |
| IRONMAN 70.3 Oceanside | +3.5% | +1.6% | +7.2% | −3.3% | 3159 |
| IRONMAN 70.3 Victoria | +3.8% | −0.2% | +9.1% | −2.7% | 753 |
| IRONMAN 70.3 Acapulco | +4.8% | +2.2% | +5.6% | +6.3% | 896 |
| IRONMAN 70.3 Los Cabos | +5.3% | +8.3% | +6.4% | +3.8% | 1240 |
| IRONMAN 70.3 Pennsylvania Happy Valley | +6.1% | +3.6% | +11.1% | −0.1% | 1515 |
| IRONMAN 70.3 Rockford | +6.3% | −10.3% | +5.4% | +12.1% | 840 |
| IRONMAN 70.3 Hawaii | +8.1% | +4.7% | +8.3% | +8.2% | 817 |
| IRONMAN 70.3 San Salvador | +9.3% | +6.0% | +15.4% | +4.7% | 209 |
| IRONMAN 70.3 World Championship Nice | +12.9% | +4.3% | +24.9% | −2.5% | 3908 |