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Trail & ultra · UTMB World Series

Istria 100 by UTMB 2027

From April 1 to 4, 2027

🇭🇷 Umag (Istrie) · Croatia

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The events

Istria 168KIstria 110KIstria 69KIstria 42KIstria 21K

When to start training

In trail running, training time depends on your finish time, not only on the distance. For this edition:

Trail under 3h3012 weeks · ideal start January 11, 2027
Trail of 3h30 to 5h3016 weeks · ideal start December 14, 2026
Trail of 5h30 to 8h20 weeks · ideal start November 16, 2026
Ultra of 8 to 16h24 weeks · ideal start October 19, 2026
Ultra over 16h24 weeks · ideal start October 19, 2026
Your plan up to race day, in CadeviaThe Coach builds every week until the race, around your days and your level.Join the beta →

Tools for this race

Your hill pace, converted to flatWhat to drink and eat during exerciseYour 7 heart rate zonesYour maximal aerobic speed and training paces

Frequently asked questions

When is Istria 100 by UTMB 2027?

Istria 100 by UTMB 2027 takes place from April 1 to 4, 2027, in Umag (Istrie) (Croatia). Date read on October 15, 2026 from its official source.

Where can I see the results?

The organiser publishes the results on its official results page.

Does Cadevia organise this race?

No. Cadevia is a training app: we read the dates from the official sources to help you choose and prepare your race. Entries are handled by the organiser.

Where

🇭🇷 Umag (Istrie) · Croatia

Same weekend

Sun4AprRonde van Vlaanderen🇧🇪 Belgium★ IconicPros only — to followMonumentSun4AprRonde van Vlaanderen (femmes)🇧🇪 Belgium★ IconicPros only — to followMajor classic (women)Wed31MarFinale de la Coupe du monde ISMF — Villars-sur-Ollon🇨🇭 Villars-sur-Ollon · Switzerland★ IconicVertical, individual, sprint, mixe…Thu1AprHYROX Rotterdam🇳🇱 Rotterdam · NetherlandsOpen / Pro / Doubles / Relay

Trail: around the same time

Fri22JanArc of Attrition by UTMB🇬🇧 Perranporth (Cornwall) · United KingdomArc 100Arc 50Thu18MarChianti Ultra Trail by UTMB🇮🇹 Radda in Chianti · Italy100M100KThu8AprTenerife Bluetrail by UTMB🇪🇸 Puerto de la Cruz (Tenerife) · SpainTENERIFE BLUETRAIL 110KTENERIFE BLUETRAIL 73KFri23AprGrand Raid Ventoux by UTMB🇫🇷 Malaucène · France100M (UGP)100K (GEV)

Where this comes from

Date and place read on October 15, 2026 from its official source.

Results: official results page.

Cadevia does not organise this race. Spotted a mistake? Tell us.

Places: GeoNames (CC BY 4.0) and © OpenStreetMap contributors (ODbL). Base map: Natural Earth (public domain). Logos belong to their organisers and are shown so each race is easy to recognise — Cadevia has no link with them, and any logo is removed on request. Flags: flag-icons (MIT licence).