Set against the captivating backdrop of Croatia’s Istrian Peninsula, the Istria 100 by UTMB will return from 9 to 12 April 2026, concluding in the vibrant coastal town of Umag. As a revered event in the UTMB World Series, it offers five trail-running experiences to suit every level—ranging from the epic 100-mile (168 km) test of endurance to shorter challenges of 110 km, 69 km, 42 km, and 21 km. Each route meanders through medieval hilltop towns, dense forests, dramatic canyons, and sparkling coastline, delivering a mix of technical terrain, panoramic vistas, and cultural charm. Whether you're chasing distance or discovery, this event transforms Istria’s ancient landscapes into a playground for ultra runners and adventure seekers alike.
Races
100 Miles
110 km
70 km
Marathon
Half Marathon
Race Date:
10 April, 2026
The Istria 100 by UTMB 168K takes place on Friday, 10 April 2026, starting from the ancient town of Labin atop Istria’s rugged interior and finishing in the coastal city of Umag, Croatia. This monumental ultratrail pushes runners across 168 kilometers of medieval hilltops, dense forests, and undulating terrain, with a staggering 7,140 meters of elevation gain, delivering an epic and unforgettable trail adventure.
Race Date:
11 April, 2026
Organized by UTMB World Series, the Istria 110 km race takes place in April 11 2026, starting from Buzet and ending in Umag, Istria, Croatia, covering approximately 111 km of technical trails with 4,074 m of elevation gain .
Race Date:
11 April, 2026
Also hosted by UTMB World Series, the 69 km race occurs in April 11 2026, starting in Buzet and finishing in Umag, Istria, Croatia, with a distance of 69 km and 2,331 m elevation gain.
Race Date:
11 April, 2026
The Marathon (42 km)—part of the Istria 100 by UTMB series—is scheduled for April 11 2026, starting in Motovun and finishing in Umag, Istria, Croatia, spanning approximately 42 km with 1,153 m elevation gain.
Race Date:
11 April, 2026
The Half Marathon (21 km), also organized under the UTMB World Series, takes place around mid-April 2026, starting in Grožnjan and ending in Umag, Istria, Croatia, covering about 21 km with 157 m elevation gain.
Weather based on historical averages.
FAQs
What is the Istria 100 by UTMB 168K?
How long is the Istria 100 by UTMB 168K?
Where does the Istria 100 by UTMB 168K take place?
What is the elevation gain of the Istria 100 by UTMB 168K?
How can I prepare for the Istria 100 by UTMB 168K?
How do I choose the right training plan for the Istria 100 by UTMB 168K?
The Istria 100 by UTMB 168K takes place on Friday, 10 April 2026, starting from the ancient town of Labin atop Istria’s rugged interior and finishing in the coastal city of Umag, Croatia. This monumental ultratrail pushes runners across 168 kilometers of medieval hilltops, dense forests, and undulating terrain, with a staggering 7,140 meters of elevation gain, delivering an epic and unforgettable trail adventure.
The Istria 100 by UTMB 168K is 168km long.
The Istria 100 by UTMB 168K takes place in Buzet, Istria, Croatia.
The Istria 100 by UTMB 168K elevation gain is 7140 meters, which Runna classifies as a Hilly race.
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 Istria 100 by UTMB 168K?
The Istria 100 by UTMB 168K takes place on Friday, 10 April 2026, starting from the ancient town of Labin atop Istria’s rugged interior and finishing in the coastal city of Umag, Croatia. This monumental ultratrail pushes runners across 168 kilometers of medieval hilltops, dense forests, and undulating terrain, with a staggering 7,140 meters of elevation gain, delivering an epic and unforgettable trail adventure.
How long is the Istria 100 by UTMB 168K?
The Istria 100 by UTMB 168K is 168km long.
Where does the Istria 100 by UTMB 168K take place?
The Istria 100 by UTMB 168K takes place in Buzet, Istria, Croatia.
What is the elevation gain of the Istria 100 by UTMB 168K?
The Istria 100 by UTMB 168K elevation gain is 7140 meters, which Runna classifies as a Hilly race.
How can I prepare for the Istria 100 by UTMB 168K?
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 Istria 100 by UTMB 168K?
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 Istria 100 by UTMB 110K?
How long is the Istria 100 by UTMB 110K?
Where does the Istria 100 by UTMB 110K take place?
What is the elevation gain of the Istria 100 by UTMB 110K?
How can I prepare for the Istria 100 by UTMB 110K?
How do I choose the right training plan for the Istria 100 by UTMB 110K?
Organized by UTMB World Series, the Istria 110 km race takes place in April 11 2026, starting from Buzet and ending in Umag, Istria, Croatia, covering approximately 111 km of technical trails with 4,074 m of elevation gain .
The Istria 100 by UTMB 110K is 110km long.
The Istria 100 by UTMB 110K takes place in Buzet, Istria, Croatia.
The Istria 100 by UTMB 110K elevation gain is 4074 meters, which Runna classifies as a Hilly race.
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 Istria 100 by UTMB 110K?
Organized by UTMB World Series, the Istria 110 km race takes place in April 11 2026, starting from Buzet and ending in Umag, Istria, Croatia, covering approximately 111 km of technical trails with 4,074 m of elevation gain .
How long is the Istria 100 by UTMB 110K?
The Istria 100 by UTMB 110K is 110km long.
Where does the Istria 100 by UTMB 110K take place?
The Istria 100 by UTMB 110K takes place in Buzet, Istria, Croatia.
What is the elevation gain of the Istria 100 by UTMB 110K?
The Istria 100 by UTMB 110K elevation gain is 4074 meters, which Runna classifies as a Hilly race.
How can I prepare for the Istria 100 by UTMB 110K?
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 Istria 100 by UTMB 110K?
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 Istria 100 by UTMB 69K Half Ultra?
How long is the Istria 100 by UTMB 69K Half Ultra?
Where does the Istria 100 by UTMB 69K Half Ultra take place?
What is the elevation gain of the Istria 100 by UTMB 69K Half Ultra?
How can I prepare for the Istria 100 by UTMB 69K Half Ultra?
How do I choose the right training plan for the Istria 100 by UTMB 69K Half Ultra?
Also hosted by UTMB World Series, the 69 km race occurs in April 11 2026, starting in Buzet and finishing in Umag, Istria, Croatia, with a distance of 69 km and 2,331 m elevation gain.
The Istria 100 by UTMB 69K Half Ultra is 69km long.
The Istria 100 by UTMB 69K Half Ultra takes place in Buzet, Istria, Croatia.
The Istria 100 by UTMB 69K Half Ultra elevation gain is 2331 meters, which Runna classifies as a Hilly race.
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 Istria 100 by UTMB 69K Half Ultra?
Also hosted by UTMB World Series, the 69 km race occurs in April 11 2026, starting in Buzet and finishing in Umag, Istria, Croatia, with a distance of 69 km and 2,331 m elevation gain.
How long is the Istria 100 by UTMB 69K Half Ultra?
The Istria 100 by UTMB 69K Half Ultra is 69km long.
Where does the Istria 100 by UTMB 69K Half Ultra take place?
The Istria 100 by UTMB 69K Half Ultra takes place in Buzet, Istria, Croatia.
What is the elevation gain of the Istria 100 by UTMB 69K Half Ultra?
The Istria 100 by UTMB 69K Half Ultra elevation gain is 2331 meters, which Runna classifies as a Hilly race.
How can I prepare for the Istria 100 by UTMB 69K Half Ultra?
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 Istria 100 by UTMB 69K Half Ultra?
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 Istria 100 by UTMB Marathon?
How long is the Istria 100 by UTMB Marathon?
Where does the Istria 100 by UTMB Marathon take place?
What is the elevation gain of the Istria 100 by UTMB Marathon?
How can I prepare for the Istria 100 by UTMB Marathon?
How do I choose the right training plan for the Istria 100 by UTMB Marathon?
The Marathon (42 km)—part of the Istria 100 by UTMB series—is scheduled for April 11 2026, starting in Motovun and finishing in Umag, Istria, Croatia, spanning approximately 42 km with 1,153 m elevation gain.
The Istria 100 by UTMB Marathon is 42km long.
The Istria 100 by UTMB Marathon takes place in Buzet, Istria, Croatia.
The Istria 100 by UTMB Marathon elevation gain is 1153 meters, which Runna classifies as a Hilly race.
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 Istria 100 by UTMB Marathon?
The Marathon (42 km)—part of the Istria 100 by UTMB series—is scheduled for April 11 2026, starting in Motovun and finishing in Umag, Istria, Croatia, spanning approximately 42 km with 1,153 m elevation gain.
How long is the Istria 100 by UTMB Marathon?
The Istria 100 by UTMB Marathon is 42km long.
Where does the Istria 100 by UTMB Marathon take place?
The Istria 100 by UTMB Marathon takes place in Buzet, Istria, Croatia.
What is the elevation gain of the Istria 100 by UTMB Marathon?
The Istria 100 by UTMB Marathon elevation gain is 1153 meters, which Runna classifies as a Hilly race.
How can I prepare for the Istria 100 by UTMB 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 Istria 100 by UTMB 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 Istria 100 by UTMB Half Marathon?
How long is the Istria 100 by UTMB Half Marathon?
Where does the Istria 100 by UTMB Half Marathon take place?
What is the elevation gain of the Istria 100 by UTMB Half Marathon?
How can I prepare for the Istria 100 by UTMB Half Marathon?
How do I choose the right training plan for the Istria 100 by UTMB Half Marathon?
The Half Marathon (21 km), also organized under the UTMB World Series, takes place around mid-April 2026, starting in Grožnjan and ending in Umag, Istria, Croatia, covering about 21 km with 157 m elevation gain.
The Istria 100 by UTMB Half Marathon is 21km long.
The Istria 100 by UTMB Half Marathon takes place in Buzet, Istria, Croatia.
The Istria 100 by UTMB Half Marathon elevation gain is 157 meters, which Runna classifies as a Rolling race.
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 Istria 100 by UTMB Half Marathon?
The Half Marathon (21 km), also organized under the UTMB World Series, takes place around mid-April 2026, starting in Grožnjan and ending in Umag, Istria, Croatia, covering about 21 km with 157 m elevation gain.
How long is the Istria 100 by UTMB Half Marathon?
The Istria 100 by UTMB Half Marathon is 21km long.
Where does the Istria 100 by UTMB Half Marathon take place?
The Istria 100 by UTMB Half Marathon takes place in Buzet, Istria, Croatia.
What is the elevation gain of the Istria 100 by UTMB Half Marathon?
The Istria 100 by UTMB Half Marathon elevation gain is 157 meters, which Runna classifies as a Rolling race.
How can I prepare for the Istria 100 by UTMB 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 Istria 100 by UTMB 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!
More
Sport:
Running
Tags:
UTMB
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Istria 100 by UTMB or Ultra-Trail du Mont-Blanc (UTMB). 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 Istria 100 by UTMB website.
