UltraSwim 33.3 Croatia

UltraSwim 33.3 Croatia is an early-season open-water challenge on Hvar Island, swimming from historic Stari Grad to Hvar Town via hidden bays and small islands. Mid-May water is typically around 19–21°C, with long daylight hours and a strong “swim-holiday” vibe.

The headline challenge is the 33.3 km (English Channel distance), but it’s not swum in one go — it’s split across several days. Expect roughly 4 days and 5–7 separate swims, usually including one 10 km+ marathon-style segment (final routing depends on conditions). This format lets you tackle a big ultra distance with recovery, logistics, and support built in.

If you want a softer entry, Croatia also offers the 33.3/2 BUILD (Half Channel) option — non-competitive, with shorter swims that add up to about half the total distance, still spread over multiple days (the plan can be modified on the day if weather requires).

What’s unique about Croatia:

• Start and finish in different towns (two venues in one event)
• Possible two ~2.3 km channel-style crossings (weather-dependent)
• Croatia-only ULTIMATE add-on: a non-stop 33.3 km (or 22.2 km) ultra marathon with dedicated support crew/boat setup.