UTMB World Series EventChecked 2026-08-17
Official UTMB World Series Event; eligible finishers can earn Running Stones and record a UTMB Index result.
Official classification source ↗EventsFind this location on a map 2 editions
CRORunningTrail100K · 100 km / 62.1 mi100M20K · 20 km / 12.4 mi21.5K · 21.5 km / 13.4 mi42.1K · 42.1 km / 26.2 mi50K · 50 km / 31.1 miUltra · 50 km+ / 31+ miUTMB World Series Event
Istria 100 by UTMB
Umag, Istria · CRO
Next race day
Fri, 2 Apr 2027
Time TBC · BST
About Istria 100 by UTMB
Istria 100 by UTMB is a running event in Umag, Istria, Croatia. Recorded disciplines include 100K, 100M, 20K, 21.5K, 42.1K, 50K, Ultra. The listed surface is trail. The listed organiser is UTMB World Series / local organiser. The next listed date is 2 April 2027. Check the organiser's information for entry and race-day arrangements. The ATHRECS archive includes editions from 2023 to 2026. This describes the editions recorded here, not the event's founding date or complete history.
Athlete profiles
Explore some of the athletes with recorded results at Istria 100 by UTMB.
Dates, starts & entry
Times are local to the race. Select the entry route for your distance.
- Entry details
168K · 168 km / 104.4 mi
Fri, 2 Apr 2027
Start time not yet confirmed
Entries open
168K: 168 km, starting at Labin.
Edition source - Entry details
42K · 42 km / 26.1 mi
Sat, 3 Apr 2027
Start time not yet confirmed
Entries open
42K: 42 km, starting at Motovun.
Edition source - Entry details
69.6K · 69.6 km / 43.2 mi
Sat, 3 Apr 2027
Start time not yet confirmed
Entries open
69K: 69.6 km, starting at Buzet.
Edition source - Entry details
111K · 111 km / 69.0 mi
Sat, 3 Apr 2027
Start time not yet confirmed
Entries open
110K: 111 km, starting at Buzet.
Edition source - Entry details
21.5K · 21.5 km / 13.4 mi
Sun, 4 Apr 2027
Start time not yet confirmed
Entries open
21K: 21.5 km, starting at Grožnjan .
Edition source
Location & race day
Listed venue / area
Umag, IstriaCRO
Confirm the exact start line, parking and arrival instructions with the organiser. A listed town or postcode may cover a wider area.
About the race
Official UTMB World Series event in Umag, Istria, Croatia. Check the organiser page for the individual races, mandatory kit, entry requirements and current Running Stones information.
- Surface:
- Trail
- Organiser:
- UTMB World Series / local organiser
Series & qualification
Classification is checked against the official series source and recorded by edition where qualification status can change.
Ways to enter
Compare the listed booking routes. Verified links show when they were checked.
Fri, 2 Apr 2027
Official race entry
Official entry
Entries open
Recorded Wed, 14 Oct 2026
View Official race entryThird-party prices, booking fees, allocations and refund terms can differ. Confirm the final details with the provider before paying.
Results
Public-figure or athlete-approved ATHRECS results, plus verified organiser links.
Sun, 12 Apr 2026
21.5K · 21.5 km / 13.4 mi
Sat, 15 Apr 2023
42.1K · 42.1 km / 26.2 mi
Past races
21.5K · 21.5 km / 13.4 miFinishedResults
Sun, 12 Apr 2026
Historical UTMB source record. Trail classification provisional. Ascent 157 m. UTMB Index category 20K is not the course distance.
42.1K · 42.1 km / 26.2 miFinishedResults
Sat, 15 Apr 2023
Historical UTMB source record. Trail classification provisional. Ascent 950 m. UTMB Index category 50K is not the course distance.
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1 past editions
Race details