Run at your own pace during the Hawaii Kai Ultra Run XTreme 2025, happening July 26–27 at Kalama Valley Park, Honolulu. The event features seven distance options—from Half Marathon up to ultra challenges (50K, 50 miles, 100K, 100 miles)—all looping a challenging 9-mile course that includes scenic oceanfront routes and the notorious "Heartbreak Hill," with aid stations every ~2.5 miles. . New in 2025 are wave-start times for Half, 30K, and Marathon, though all runners may sign in and begin anytime before noon Sunday. . The “choose-your-own-start” format and lack of cutoffs offer ultimate flexibility for solo runners, travelers, and multi-day ultra enthusiasts.
Races
100 miles
100 km
50 miles
50 km
Marathon
30 km
Half Marathon
Held on July 26–27, 2025, the 100-Mile race begins at Kalama Valley Park in Hawaii Kai, Honolulu, and is organized by the Hawaii Running Project. This grueling ultra challenges athletes to complete eleven loops of the 9-mile course, with an estimated total elevation gain of over 6,000 feet.
The 100K race happens on July 26–27, 2025, at Kalama Valley Park, Hawaii Kai, Honolulu, managed by the Hawaii Running Project. Runners take on nearly seven laps of the route, covering rugged climbs and long stretches of sun-exposed roadway.
Also taking place on July 26–27, 2025, the 50-Mile race is based at Kalama Valley Park in Hawaii Kai, Honolulu, and organized by the Hawaii Running Project. This endurance event spans over five full loops of the hilly course, testing runners with tropical heat and steep ascents.
The 50K event is held on July 26–27, 2025, in Hawaii Kai, Honolulu, and organized by the Hawaii Running Project. Runners complete over five laps on the technical road course starting at Kalama Valley Park, with considerable elevation from recurring climbs.
Taking place on July 26–27, 2025, the Marathon begins at Kalama Valley Park, Hawaii Kai, Honolulu, and is organized by the Hawaii Running Project. Participants complete nearly three loops of the hilly 9-mile course in warm and humid conditions, with aid stations every 2.5 miles.
Also scheduled for July 26–27, 2025, the 30K takes place on the same 9-mile loop course around Hawaii Kai, organized by the Hawaii Running Project. Participants choose their start time and enjoy well-supported aid stations, with no enforced cutoffs for those starting before noon Sunday.
Held on July 26–27, 2025, the Half Marathon is hosted by the Hawaii Running Project at Kalama Valley Park in Hawaii Kai, Honolulu. Runners complete a scenic 9-mile loop featuring the notorious “Heartbreak Hill,” with aid stations approximately every 2.5 miles and a flexible start time between 3 AM Saturday and noon Sunday.
Weather based on historical averages.
FAQs
What is the Hawaii Kai Ultra Run XTreme 100 Miles?
How long is the Hawaii Kai Ultra Run XTreme 100 Miles?
Where does the Hawaii Kai Ultra Run XTreme 100 Miles take place?
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 100 Miles?
How can I prepare for the Hawaii Kai Ultra Run XTreme 100 Miles?
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 100 Miles?
Held on July 26–27, 2025, the 100-Mile race begins at Kalama Valley Park in Hawaii Kai, Honolulu, and is organized by the Hawaii Running Project. This grueling ultra challenges athletes to complete eleven loops of the 9-mile course, with an estimated total elevation gain of over 6,000 feet.
The Hawaii Kai Ultra Run XTreme 100 Miles is 161km long.
The Hawaii Kai Ultra Run XTreme 100 Miles takes place in Honolulu, HI, USA.
Runna classifies the Hawaii Kai Ultra Run XTreme 100 Miles elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 100 Miles?
Held on July 26–27, 2025, the 100-Mile race begins at Kalama Valley Park in Hawaii Kai, Honolulu, and is organized by the Hawaii Running Project. This grueling ultra challenges athletes to complete eleven loops of the 9-mile course, with an estimated total elevation gain of over 6,000 feet.
How long is the Hawaii Kai Ultra Run XTreme 100 Miles?
The Hawaii Kai Ultra Run XTreme 100 Miles is 161km long.
Where does the Hawaii Kai Ultra Run XTreme 100 Miles take place?
The Hawaii Kai Ultra Run XTreme 100 Miles takes place in Honolulu, HI, USA.
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 100 Miles?
Runna classifies the Hawaii Kai Ultra Run XTreme 100 Miles elevation profile as Flat.
How can I prepare for the Hawaii Kai Ultra Run XTreme 100 Miles?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 100 Miles?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 100K?
How long is the Hawaii Kai Ultra Run XTreme 100K?
Where does the Hawaii Kai Ultra Run XTreme 100K take place?
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 100K?
How can I prepare for the Hawaii Kai Ultra Run XTreme 100K?
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 100K?
The 100K race happens on July 26–27, 2025, at Kalama Valley Park, Hawaii Kai, Honolulu, managed by the Hawaii Running Project. Runners take on nearly seven laps of the route, covering rugged climbs and long stretches of sun-exposed roadway.
The Hawaii Kai Ultra Run XTreme 100K is 100km long.
The Hawaii Kai Ultra Run XTreme 100K takes place in Honolulu, HI, USA.
Runna classifies the Hawaii Kai Ultra Run XTreme 100K elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 100K?
The 100K race happens on July 26–27, 2025, at Kalama Valley Park, Hawaii Kai, Honolulu, managed by the Hawaii Running Project. Runners take on nearly seven laps of the route, covering rugged climbs and long stretches of sun-exposed roadway.
How long is the Hawaii Kai Ultra Run XTreme 100K?
The Hawaii Kai Ultra Run XTreme 100K is 100km long.
Where does the Hawaii Kai Ultra Run XTreme 100K take place?
The Hawaii Kai Ultra Run XTreme 100K takes place in Honolulu, HI, USA.
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 100K?
Runna classifies the Hawaii Kai Ultra Run XTreme 100K elevation profile as Flat.
How can I prepare for the Hawaii Kai Ultra Run XTreme 100K?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 100K?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 50 Miles?
How long is the Hawaii Kai Ultra Run XTreme 50 Miles?
Where does the Hawaii Kai Ultra Run XTreme 50 Miles take place?
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 50 Miles?
How can I prepare for the Hawaii Kai Ultra Run XTreme 50 Miles?
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 50 Miles?
Also taking place on July 26–27, 2025, the 50-Mile race is based at Kalama Valley Park in Hawaii Kai, Honolulu, and organized by the Hawaii Running Project. This endurance event spans over five full loops of the hilly course, testing runners with tropical heat and steep ascents.
The Hawaii Kai Ultra Run XTreme 50 Miles is 80km long.
The Hawaii Kai Ultra Run XTreme 50 Miles takes place in Honolulu, HI, USA.
Runna classifies the Hawaii Kai Ultra Run XTreme 50 Miles elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 50 Miles?
Also taking place on July 26–27, 2025, the 50-Mile race is based at Kalama Valley Park in Hawaii Kai, Honolulu, and organized by the Hawaii Running Project. This endurance event spans over five full loops of the hilly course, testing runners with tropical heat and steep ascents.
How long is the Hawaii Kai Ultra Run XTreme 50 Miles?
The Hawaii Kai Ultra Run XTreme 50 Miles is 80km long.
Where does the Hawaii Kai Ultra Run XTreme 50 Miles take place?
The Hawaii Kai Ultra Run XTreme 50 Miles takes place in Honolulu, HI, USA.
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 50 Miles?
Runna classifies the Hawaii Kai Ultra Run XTreme 50 Miles elevation profile as Flat.
How can I prepare for the Hawaii Kai Ultra Run XTreme 50 Miles?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 50 Miles?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 50K?
How long is the Hawaii Kai Ultra Run XTreme 50K?
Where does the Hawaii Kai Ultra Run XTreme 50K take place?
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 50K?
How can I prepare for the Hawaii Kai Ultra Run XTreme 50K?
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 50K?
The 50K event is held on July 26–27, 2025, in Hawaii Kai, Honolulu, and organized by the Hawaii Running Project. Runners complete over five laps on the technical road course starting at Kalama Valley Park, with considerable elevation from recurring climbs.
The Hawaii Kai Ultra Run XTreme 50K is 50km long.
The Hawaii Kai Ultra Run XTreme 50K takes place in Honolulu, HI, USA.
Runna classifies the Hawaii Kai Ultra Run XTreme 50K elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 50K?
The 50K event is held on July 26–27, 2025, in Hawaii Kai, Honolulu, and organized by the Hawaii Running Project. Runners complete over five laps on the technical road course starting at Kalama Valley Park, with considerable elevation from recurring climbs.
How long is the Hawaii Kai Ultra Run XTreme 50K?
The Hawaii Kai Ultra Run XTreme 50K is 50km long.
Where does the Hawaii Kai Ultra Run XTreme 50K take place?
The Hawaii Kai Ultra Run XTreme 50K takes place in Honolulu, HI, USA.
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 50K?
Runna classifies the Hawaii Kai Ultra Run XTreme 50K elevation profile as Flat.
How can I prepare for the Hawaii Kai Ultra Run XTreme 50K?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 50K?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme Marathon?
How long is the Hawaii Kai Ultra Run XTreme Marathon?
Where does the Hawaii Kai Ultra Run XTreme Marathon take place?
What is the elevation gain of the Hawaii Kai Ultra Run XTreme Marathon?
How can I prepare for the Hawaii Kai Ultra Run XTreme Marathon?
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme Marathon?
Taking place on July 26–27, 2025, the Marathon begins at Kalama Valley Park, Hawaii Kai, Honolulu, and is organized by the Hawaii Running Project. Participants complete nearly three loops of the hilly 9-mile course in warm and humid conditions, with aid stations every 2.5 miles.
The Hawaii Kai Ultra Run XTreme Marathon is 42km long.
The Hawaii Kai Ultra Run XTreme Marathon takes place in Honolulu, HI, USA.
Runna classifies the Hawaii Kai Ultra Run XTreme Marathon elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme Marathon?
Taking place on July 26–27, 2025, the Marathon begins at Kalama Valley Park, Hawaii Kai, Honolulu, and is organized by the Hawaii Running Project. Participants complete nearly three loops of the hilly 9-mile course in warm and humid conditions, with aid stations every 2.5 miles.
How long is the Hawaii Kai Ultra Run XTreme Marathon?
The Hawaii Kai Ultra Run XTreme Marathon is 42km long.
Where does the Hawaii Kai Ultra Run XTreme Marathon take place?
The Hawaii Kai Ultra Run XTreme Marathon takes place in Honolulu, HI, USA.
What is the elevation gain of the Hawaii Kai Ultra Run XTreme Marathon?
Runna classifies the Hawaii Kai Ultra Run XTreme Marathon elevation profile as Flat.
How can I prepare for the Hawaii Kai Ultra Run XTreme Marathon?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme Marathon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 30K?
How long is the Hawaii Kai Ultra Run XTreme 30K?
Where does the Hawaii Kai Ultra Run XTreme 30K take place?
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 30K?
How can I prepare for the Hawaii Kai Ultra Run XTreme 30K?
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 30K?
Also scheduled for July 26–27, 2025, the 30K takes place on the same 9-mile loop course around Hawaii Kai, organized by the Hawaii Running Project. Participants choose their start time and enjoy well-supported aid stations, with no enforced cutoffs for those starting before noon Sunday.
The Hawaii Kai Ultra Run XTreme 30K is 30km long.
The Hawaii Kai Ultra Run XTreme 30K takes place in Honolulu, HI, USA.
Runna classifies the Hawaii Kai Ultra Run XTreme 30K elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme 30K?
Also scheduled for July 26–27, 2025, the 30K takes place on the same 9-mile loop course around Hawaii Kai, organized by the Hawaii Running Project. Participants choose their start time and enjoy well-supported aid stations, with no enforced cutoffs for those starting before noon Sunday.
How long is the Hawaii Kai Ultra Run XTreme 30K?
The Hawaii Kai Ultra Run XTreme 30K is 30km long.
Where does the Hawaii Kai Ultra Run XTreme 30K take place?
The Hawaii Kai Ultra Run XTreme 30K takes place in Honolulu, HI, USA.
What is the elevation gain of the Hawaii Kai Ultra Run XTreme 30K?
Runna classifies the Hawaii Kai Ultra Run XTreme 30K elevation profile as Flat.
How can I prepare for the Hawaii Kai Ultra Run XTreme 30K?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme 30K?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme Half Marathon?
How long is the Hawaii Kai Ultra Run XTreme Half Marathon?
Where does the Hawaii Kai Ultra Run XTreme Half Marathon take place?
What is the elevation gain of the Hawaii Kai Ultra Run XTreme Half Marathon?
How can I prepare for the Hawaii Kai Ultra Run XTreme Half Marathon?
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme Half Marathon?
Held on July 26–27, 2025, the Half Marathon is hosted by the Hawaii Running Project at Kalama Valley Park in Hawaii Kai, Honolulu. Runners complete a scenic 9-mile loop featuring the notorious “Heartbreak Hill,” with aid stations approximately every 2.5 miles and a flexible start time between 3 AM Saturday and noon Sunday.
The Hawaii Kai Ultra Run XTreme Half Marathon is 21km long.
The Hawaii Kai Ultra Run XTreme Half Marathon takes place in Honolulu, HI, USA.
Runna classifies the Hawaii Kai Ultra Run XTreme Half Marathon elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Hawaii Kai Ultra Run XTreme Half Marathon?
Held on July 26–27, 2025, the Half Marathon is hosted by the Hawaii Running Project at Kalama Valley Park in Hawaii Kai, Honolulu. Runners complete a scenic 9-mile loop featuring the notorious “Heartbreak Hill,” with aid stations approximately every 2.5 miles and a flexible start time between 3 AM Saturday and noon Sunday.
How long is the Hawaii Kai Ultra Run XTreme Half Marathon?
The Hawaii Kai Ultra Run XTreme Half Marathon is 21km long.
Where does the Hawaii Kai Ultra Run XTreme Half Marathon take place?
The Hawaii Kai Ultra Run XTreme Half Marathon takes place in Honolulu, HI, USA.
What is the elevation gain of the Hawaii Kai Ultra Run XTreme Half Marathon?
Runna classifies the Hawaii Kai Ultra Run XTreme Half Marathon elevation profile as Flat.
How can I prepare for the Hawaii Kai Ultra Run XTreme Half Marathon?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Hawaii Kai Ultra Run XTreme Half Marathon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
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This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Hawaii Kai Ultra Run XTreme 2025 or Hawaii Running Project. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Hawaii Kai Ultra Run XTreme 2025 website.
