Kona 2026 by the Numbers: Splits, Heat and the Late-Race Fades

Splits come from TRI247’s finishing orders (Slowtwitch’s tables show many of them one second higher), gaps and lead changes from Slowtwitch’s race reports, and weather from the station at Keahole Point, Kona. Our own calculations are marked as such.

The Results in Splits

Luis, who had said Kona would be the last race of his career, became the first French man to win the title in Hawaii (TRI247). By our arithmetic from TRI247’s splits, he was the only man in the top ten who finished within five minutes of the best top-ten split in all three disciplines: 13 seconds off the fastest swim, 4:19 off the fastest ride and 1:38 off the fastest marathon.

Gustav Iden ran that fastest marathon, 2:36:57, and finished 1:35 behind. He was given a three-minute drafting penalty late in the bike: Slowtwitch reports he served it before T2, while TRI247 says it held him back at the start of his marathon and puts him almost nine minutes behind the leaders out of T2. Matthew Marquardt, also penalised on the bike, rode to within five seconds of Gregory Barnaby’s 4:11:22, the fastest bike split among the finishers, and held on for third. Ditlev’s own ride, 4:06:47, was quicker than any finisher’s.

In the women’s race Knibb had the fastest swim and bike in the top ten, then lost 7:03 to Laura Philipp on the run. Philipp left the water 30th, 8:34 behind Lucy Charles-Barclay, started the marathon tenth and 9:52 down, and ran 2:50:42, the fastest marathon among the women’s finishers, to take second. Julie Derron was third on her Kona debut despite her own three-minute drafting penalty. Knibb’s win came a month after her fourth IRONMAN 70.3 world title in Nice (TRI247).

How the Lead Changed Hands

Ditlev came out of the water 30th, 2:02 down, and rode up through the field on the climb to Hawi. He took the lead when Marquardt was shown a blue card for drafting, reached T2 with 1:27 in hand over Sam Laidlow, and still led by 4:10 at 11 miles of the run. Then the gap shrank quickly: about four minutes with ten miles left, 3:40 out of the Energy Lab, two minutes just past mile 19 after he stopped at an aid station for ice, and 1:49 at mile 20 (TRI247). Luis passed him at the mile 21 aid station, with Iden right behind. TRI247 lists Ditlev among five men who did not finish.

Knibb and Charles-Barclay swapped the bike lead at least five times before Knibb pulled clear on the last stretch of the Queen K. Løvseth started the marathon third, 4:48 down, and closed steadily. At the same mile 21 aid station where Luis had taken the men’s lead, she passed Knibb. Charles-Barclay had stopped at about 28 km and withdrawn. Løvseth came down Palani Hill nearly two minutes clear; in the last mile she fell, got up, fell again, and was down a third time a kilometre from the line, where Knibb went past.

Conditions: Swell, Rain, Then Heat

According to Slowtwitch, the cannon fired at 6:20 a.m. in the rain, into a swell that made the swim choppy, and broadcast analyst Daniela Ryf said many of the women looked seasick climbing out of the water. The roads were wet but not treacherous. The sun broke through at the start of the climb to Hawi, where the wind was strong, and Marten Van Riel was seen vomiting on the bike. Knibb’s winning ride was about nine minutes slower than her own bike split a year earlier, which Slowtwitch puts down to wet roads, wind and humidity.

The weather station at Keahole Point (PHKO), archived by Iowa State University’s Iowa Environmental Mesonet, logged 26.1 °C (79 °F) and 88% relative humidity at 6:53 a.m. Over the hourly readings taken while the winners were running (11:53 to 14:53), the air was 29.4–30.6 °C (85–87 °F) at 61–67% relative humidity, a heat index of 33.2–34.7 °C (92–94 °F).

The two big outlets described the run differently. Slowtwitch called conditions for the women’s marathon kinder than in 2025, with cloud cover, light winds and temperatures that were not too punishing; Triathlete described a brutally hot and humid course. The station data can’t settle that: it is a single station, and it records air temperature and humidity, not the wet-bulb globe temperature (WBGT) used in heat research.

Who Faded, and What They Said

Magnus Ditlev lost the first half of his season to shingles and took the last Kona slot at Frankfurt (Slowtwitch). On Instagram, quoted by TRI247, he said he had executed his pacing, cooling and nutrition plan and thought he stayed within his limits, but “heading back from the Energy Lab, the lights suddenly went out.” In the end, he wrote, pushing on was neither possible nor responsible.

Solveig Løvseth told Triathlete she really wanted to stop. She did not want a DNF, she said, but she still put her health first by lying down; she then waved off the medical team and carried on to the finish. None of the reports we read gives a medical cause, so we don’t offer one.

Lucy Charles-Barclay raced off heart rate and core temperature data with finishing healthy as her priority, according to Slowtwitch, and still stopped at about 28 km: her second Kona DNF in a row. Kristian Blummenfelt ran with Luis into second and third at halfway, then faded to eighth with a 2:49:05 marathon. Sam Laidlow’s exit before mile four had a different cause: he said he had been fighting a blood-flow problem in his left leg for the whole ride, which Slowtwitch reports as external iliac artery endofibrosis; TRI247 reports he will have surgery.

Taylor Knibb was struggling at 23 km, heading into the Energy Lab, and told the press conference she made a decision then: “You need to take care of yourself to get to the finish line.” When Løvseth caught her she let her go, and walked the aid stations to take things in (TRI247). Slowtwitch reports she appeared to vomit on the way back from the Energy Lab. A year earlier, her race had ended two miles from the finish.

What Research Says About Late Fades

The reports we read contain no power, heart rate, intake or core temperature data from these athletes’ races, so no study can say why any one of them cracked. What the research does show is which pressures build late in a long, hot race.

Heat. The consensus statement on training and competing in the heat by Racinais and colleagues (2015) says heat stress significantly impairs prolonged exercise capacity, and that athletes race endurance events at a lower work rate than in temperate conditions. In a study of seven marathons, Ely and colleagues (2007) found the top men were 1.7% slower than the course record in the coolest WBGT band (5.1–10 °C) and 4.5% slower in the warmest (20.1–25 °C), and slower runners lost more. There is no WBGT reading for Kona, so these figures show the direction of the effect, not a Kona estimate.

Fluids. The same consensus statement notes that many studies find performance falls once body-water deficits exceed about 2% of body mass in warm to hot conditions, and it recommends starting euhydrated and limiting losses. Jan Frodeno said Patrick Lange told him he kept cramping however much water he drank (Slowtwitch); Lange did not finish.

The gut. In a 2000 study of 29 athletes in a long-distance triathlon, Jeukendrup and colleagues recorded gastrointestinal symptoms in 93% of participants, and 7% abandoned the race. A 2019 review by Costa and colleagues reports symptom rates of 70% or less in temperate lab conditions against 88% or more in hot conditions, with markers of gut injury rising with heat. In the studies they review, frequent small doses of tolerable carbohydrate before and during exercise in the heat reduced that injury, and dehydration made it worse. Caveats: these are lab trials of about two hours of running, and some data are unpublished.

Pacing. Knechtle and colleagues (2023) analysed 25 run splits per athlete from Kona 2022. The top ten men slowed only slightly across the marathon, less than the men placed 11th to 30th, and the top twenty men paced it less variably than those placed 21st to 30th; all three women’s groups showed a slight slowdown.

What Age-Groupers Can Take From It

• Acclimatise. Racinais and colleagues rank heat acclimatisation as the most important step, built from repeated exercise-heat exposures over one to two weeks. Our guide to heat training covers how to set that up.
• Drink to a plan. Start euhydrated and keep body-water losses small without drinking so much that you gain weight; the statement links deficits above about 2% of body mass to lower performance in the heat.
• Practise fuelling in the heat. The consensus statement lists 30–60 g of carbohydrate per hour for exercise over an hour and up to 90 g/h beyond 2.5 hours. Costa and colleagues advise an individual gastrointestinal assessment in heat that mirrors training or competition, using your usual food and fluids, and practising race nutrition in training. Our piece on higher carbohydrate intakes and gut training goes further.
• Cool on the move. Ditlev took time at aid stations to cool himself with ice (TRI247). In studies cited by the consensus statement, ice slurry taken before or during exercise improved endurance performance, though the authors call the effect of cooling in competition equivocal.
• Expect the race to turn late. Luis started the marathon six minutes down and Philipp nearly ten, and both moved up as others slowed or stopped. Knibb’s answer to a bad patch was to walk the aid stations and take things in.

Without Casper Stornes, who led Norway’s podium sweep in Nice in 2025 and was ruled out of Kona after a bike crash (Slowtwitch), Iden was second and Blummenfelt eighth. For how the Norwegians train, see our breakdown of their method.

Full Top-Ten Splits

Bold marks the fastest split in each column among the top ten. Totals include transitions. Splits and totals from TRI247’s finishing orders (11 October 2026).

Sources

• Results: TRI247, Matthew Reeder, “IRONMAN World Championship 2026: Men’s full finishing order and Pro Series standings” (11 Oct 2026); TRI247, Jonathan Turner, “IRONMAN World Championship 2026: Women’s full finishing order and Pro Series standings” (11 Oct 2026).
• Race reports: Slowtwitch, Ryan Heisler, “Vincent Luis Captures 2026 IRONMAN World Championship on Kona Debut” (10 Oct 2026); Slowtwitch, Ryan Heisler, “Taylor Knibb Exorcises the Kona Demons, Wins 2026 IRONMAN World Championship” (10 Oct 2026).
• Athletes’ accounts: TRI247, Jonathan Turner, “Magnus Ditlev on Kona heartbreak: ‘The lights suddenly went out’” (13 Oct 2026); TRI247, Jonathan Turner, “Taylor Knibb fulfils childhood Kona dream by learning to let go: ‘The island will always win’” (11 Oct 2026); Triathlete, Travis Mundell and Abby Levene, “Solveig Løvseth shares how she kept going after calamitous Kona collapse” (updated 14 Oct 2026).
• Weather: Iowa Environmental Mesonet (Iowa State University), ASOS archive, station PHKO (Keahole Point/Kona), hourly observations for 10 Oct 2026 in Hawaii time (read 26 Oct 2026).
• Research: Racinais S et al., “Consensus recommendations on training and competing in the heat,” Br J Sports Med 2015;49(18):1164–1173; Ely MR et al., “Impact of weather on marathon-running performance,” Med Sci Sports Exerc 2007;39(3):487–493; Jeukendrup AE et al., Clin Sci 2000;98(1):47–55 (gastrointestinal complaints during a long-distance triathlon); Costa RJS et al., “Exertional-heat stress-associated gastrointestinal perturbations during Olympic sports,” Temperature 2019;7(1):58–88; Knechtle B et al., “Performance and pacing of professional IRONMAN triathletes: the fastest IRONMAN World Championship ever, IRONMAN Hawaii 2022,” Sci Rep 2023;13:15708.

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