Races/Croatia
Training plan for the Istria 100 by UTMB 110K
Saturday, 3 April 2027 in Umag, Croatia. That is 19 weeks away.
When a build would have to start
OLTRA plans a block of a length that suits the distance, then works backwards from race day. For this one:
100K — a 24-week build, 6 runs a week
Not enough room left for the full build.
Too close? The next one
The organiser runs this the first Saturday in April, which puts the 2028 race on Saturday, 1 April 2028. That date is not announced yet, so check it before planning to it — but a 100K build for it would start the week of 11 October 2027.
On the day
One distance: 100K. Entries, course and timings are istria.utmb.world’s. They decide when entries open and close, and whether the race runs at all — OLTRA sells nothing here and takes nothing from them.
The date here is the one the organiser published, rechecked every 1 hour against the list. Confirm it on their site before you enter.