IRONMAN World Championship (Kona)
Kailua-Kona, United States · October · IRONMAN
Why people love it
- Iconic pier swim start in very clear water of about 26-27 °C (79-81 °F)
- Ali'i Drive finish and lava-field marathon atmosphere
- Staggered swim waves since 2019 reduce bike crowding
- World championship status: qualification only
Watch out for
- Brutal heat and humidity, 24-31 °C (75-88 °F), with no shade on the Queen K
- Strong cross and headwinds to Hawi on the 180 km (112 mi) bike
- Very expensive lodging with long minimum stays
- Drafting packs on the bike and strict marshals
- Qualification required
Race
How racers feel about it, how well it is run, and how it treats a first timer. Counts for 27% of the overall score.
- Racer satisfactionBucket list4.6
A bucket-list championship with near-universal praise for the atmosphere, though several athletes call the day itself brutal. · High confidence
- OrganizationWell run4.2
Efficient aid, helpful volunteers and smooth check-in; past complaints include a crowded swim turnaround and too few toilets in 2012. Staggered waves since 2019 help. · Medium confidence
- First timer friendlyExperts only1.2
Qualification-only and run in extreme conditions, so not a typical first full, though at least one first-timer finished in 2004. · High confidence
Course traits, not part of the score
- PR potentialSlow2.0
Forum posters say heat and humidity cost about 20% of bike power; course records of 7:35:53 and 8:24:31 are elite-only. · Medium confidence
- Course easeExtreme1.4
Heat of 24-31 °C (75-88 °F), over 80% humidity, shadeless lava fields, Hawi crosswinds and the Energy Lab; heat exhaustion is common. · High confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 15% of the overall score.
- Wetsuit legalRarely1.0
Water is about 26-27 °C (79-81 °F), above the 24.5 °C (76.1 °F) limit, so the swim is non-wetsuit every year. · Medium confidence
- Water temperatureAcceptable2.6
Warm at about 26-27 °C (79-81 °F): comfortable, though on the warm side; this figure is an estimate. · Medium confidence
- Calm waterSome chop3.3
Slight chop and swell in 2022 and choppy water in 2026, calm in other years; the return leg can fight a current. · Medium confidence
- Swim easeModerate3.3
The pier start and boat-to-boat navigation are simple, but turnaround contact hurt in 2012 and 2017; staggered waves since 2019 help. · Medium confidence
- Swim experienceSuperb4.5
Very clear 'aquarium' water, an iconic pier start and spectators on the seawall; the turnaround gets crowded. · High confidence
Bike
Road surface, closures, scenery and wind. Counts for 19% of the overall score.
- Road surfaceGood3.8
State highway tarmac, smooth with some coarse chipseal sections; no explicit complaints. · Low confidence
- Road closuresMostly closed3.8
The highway lane is closed and heavily marshalled, with strict drafting enforcement and cone-separated traffic. · Low confidence
- Bike sceneryPleasant3.2
Stark lava desert and Pacific views; distinctive, though several athletes find it unremarkable, and Hawi village is a highlight. · Medium confidence
- WindNotoriously windy1.3
Queen K crosswinds and Hawi headwinds define the bike; disc wheels are discouraged, though 2017 was calmer. · High confidence
Course traits, not part of the score
- Bike speedAverage2.9
Mild rolling profile on smooth highway, but constant cross and headwinds plus heat slow age-groupers more than their power suggests. · Medium confidence
- Bike flatnessRolling3.1
A rolling out-and-back with a climb to Hawi; gain is commonly cited around 1,500-1,700 m (4,900-5,600 ft). · Low confidence
- Bike simplicityMostly simple4.4
A long straight highway out-and-back; only the Hawi descent needs care. · Medium confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportStrong4.4
Ali'i Drive and the finish chute are electric, while the Queen K and lava fields are lonely; the Energy Lab has music and aid. · Medium confidence
- Aid stationsAbundant4.5
Efficient aid stations and helpful volunteers, with heavy use of ice and water to manage the heat. · Medium confidence
- Run sceneryBeautiful4.0
Lava fields, then an ocean sunset on the return to Ali'i Drive. · Medium confidence
- Run conditionsBrutal1.2
Hot, humid and shadeless, with heat exhaustion and walking common; the 2015 run was about 5 °C (10 °F) hotter than earlier years. · High confidence
Course traits, not part of the score
- Run flatnessRolling3.4
A Palani Road climb and rolling Queen K; athletes mostly talk about heat rather than hills. · Low confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 15% of the overall score.
- Air temperatureHarsh2.2
Race-day air of 24-31 °C (75-88 °F) with over 80% humidity and radiant heat off the lava feels hotter than the number suggests. · Medium confidence
- Weather reliabilityReliable3.6
Heat, humidity and wind are predictable every year; sea state varies, and race-morning rain fell in 2026. · Medium confidence
- Venue beautyLovely4.3
Volcanic coast, ocean and Ali'i Drive, with a magical atmosphere reported by athletes. · Medium confidence
- Spectator friendlyEasy3.5
The seawall and Ali'i Drive are easy to watch from, but the bike is a remote 180 km (112 mi) out-and-back with heavy traffic. · Medium confidence
Course traits, not part of the score
- Low altitudeSea level5.0
Sea level, 0 m (0 ft). · High confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 11% of the overall score.
- Hotel availabilitySells out early1.5
Rentals book months ahead with 5-7 night minimums, rental cars sell out, and Waikoloa resorts are 48+ km (30+ mi) away. · High confidence
- Hotel valuePrice-gouged1.2
Race-week prices spike: about 1,500-2,000 USD a week for a two-bedroom condo, and resorts at 300+ USD a night. · High confidence
- WalkabilityWalkable3.5
Ali'i Drive condos and hotels are 1.6-3.2 km (1-2 mi) from the pier; Keauhou and Waikoloa need a shuttle or car. · Medium confidence
- Travel easeAwkward2.4
A remote island: Kona airport is close to town, but flights are long-haul and bike shipping is expensive. · Medium confidence
- LogisticsSimple3.5
Swim, T1, T2 and finish are all in town near the pier, though race week is a busy ten days. · Medium confidence
- Town and foodGood3.8
Walkable Ali'i Drive with restaurants and shops, all at island prices. · Medium confidence
Key facts
- Location
- Kailua-Kona, Hawaii, United States
- Typical month
- October
- Latest or next date
- 10 October 2026
- Organiser
- IRONMAN
- Field size
- About 2,500 athletes
- First held
- 1978
- Distances
- 3.8 km (2.4 mi) swim, 180 km (112 mi) bike, 42.2 km (26.2 mi) run
- Cutoffs
- Swim 2:20, Bike 10:30, Finish 17:00
- Swim venue
- Kailua Bay (Kailua Pier) (ocean)
- Wetsuit
- Banned
- Swim start
- wave
- Swim laps
- 1
- Bike laps
- 1
- Key climbs
- Climb to Hawi
- Run laps
- 1
- Run shade
- Little shade on Queen K and lava fields
- Air temperature
- 24–31 °C (75–88 °F)
- Humidity
- >80% on race days in 2022
- Altitude
- 0 m (0 ft)
- Nearest airport
- Kona International Airport (KOA)
- Where to stay
- Ali'i Drive, Kailua-Kona town, Keauhou (shuttle)
- Booking
- Condos book months ahead; 5-7 night minimums; rental cars sell out.
What racers and reviewers say
- RaceCheck (Andreas G.)Raced 2012 · aggregator · Positive
Rated 4.8/5. Found the swim turnaround very crowded, the bike windy and the run endless in the heat. Praised aid stations, volunteers and spectators; criticised food at the carbo dinner/party, a short late briefing and too few portable toilets. Advises arriving early to acclimate.
- Mario Staffieri race report (Tri Alliance Victoria)Raced 2024 · blog · Positive
M60-64 athlete swam 1:29 in rough ocean, held a steady bike despite strong crosswinds on the Queen K, and ran 3:41 through humid, scorching marathon conditions for an 11:28 finish. Positive, wanted to go again.
- Random Forest RunnerRaced 2017 · blog · Positive
Chaotic mass swim start but clear practice-swim water; calmer-than-expected bike winds but drafting persisted; shadeless humid run led to dehydration treatment despite the second-fastest amateur run. Strong spectator and sponsor support, hot airless pre-race week.
“It was like swimming in an aquarium.”
- Freeplay MagazineRaced 2016 · article · Positive
Swim PB without wetsuit with growing swells in second half; headwinds both to Hawi and on return; HRM failure on the run; humid heat but clouds helped on the Queen K; Energy Lab busier than expected with music and aid. Family support at mile 3 and finish.
“The last mile of the race was truly magical.”
- Slowtwitch forum: lava fields race reportRaced 2015 · forum · Mixed
Clean swim with no contact starting left of middle; return leg slowed by current; steady 4:57 bike with descent of Hawi; run about 5 °C (10 °F) hotter than earlier Kona starts forced run/walk and icing; final 10K (6.2 mi) cooler. Drafting and rider behaviour noted; called it not a fun day out.
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- Slowtwitch forum: An Iron-Virgin does KonaRaced 2004 · forum · Positive
First-timer started at the back of a crowded swim, took a drafting penalty on a windy bike with strong gusty crosswinds and sunburn risk, then ran a first marathon in the dark. Body marking, registration and expo ran smoothly; large crowds at start and finish; strict drafting enforcement.
“I want to do that again, cause I know I can do much better”
- Slowtwitch forum: Kona for a first timer logisticsRaced 2014 · forum · Positive
Thread advises staying on or near Ali'i Drive near the pier to walk to check-in, expo and parade; condos with kitchens cheaper than hotels; Ali'i traffic and parking is limited; ship bikes with a specialist; acclimate and ride in strong wind before arrival; winds on the Queen K called unreal.
- Slowtwitch forum: First Time Kona tipsforum · Mixed
Advice thread: heat is choking, acclimate in final weeks; swim can be choppy or calm so test often; heavy drafting packs; everything is expensive; many rentals require 5-night minimums; power about 20% lower and run about 1 min per mile (about 37 s per km) slower than cool races.
- Hawaii Tribune-Herald (local finishers)Raced 2019 · article · Positive
Local age-groupers describe strong headwinds on the bike, the new 11 staggered swim waves easing crowding, enthusiastic volunteers and an energising Ali'i Drive finish.
“The bike course is much better in the waves.”
- Triathlete: 2022 age groupers galleryRaced 2022 · article · Positive
Two-day championship with 5,256 age-groupers in staggered 5-minute starts; slight chop and ocean swells in Kailua Bay, air temperatures around 30 °C (upper 80s °F) and >80% humidity both days; many athletes felt it a victory lap after years of qualifying.
- Slowtwitch forum: Where to stay in KonaRaced 2005 · forum · Mixed
Condos usually 1.6 km (1 mi) or more from the pier with kitchens; King Kam most central but pricey; Kona Seaside closest and cheapest but dated; resorts north in Waikoloa are far with heavy traffic. Book condos long before race week.
- Slowtwitch forum: Hotel at Kona not too expensiveRaced 2007 · forum · Mixed
Keauhou option with race-day shuttle, Hilton/Sheraton near the pier suggested; nothing within about 3.2 km (2 mi) of the pier is cheap; Waikoloa resorts $300+/night and 48+ km (30+ mi) away with heavy race-week traffic; shuttles run Ali'i to Keauhou.
- Gather Vacations: Ironman Kona 2026 lodging guideRaced 2026 · article · Positive
Rental-company guide: stay within walking distance of Ali'i for the swim start and finish; rentals near the course book out months ahead; race week is about ten days of events; seawall spots claimed from 4:30am; limited shade so bring sun protection.
- Tri247 live coverage 2026 pro race (via search snippet)Raced 2026 · article · Mixed
Live report notes a wet morning and choppy Kailua Bay for the 2026 pro start; swim leader 48:17 for men and 51:29 for women, indicating rough conditions. (Page not fetched directly; content from search summary.)
Sources
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