Open Water Events for 2025 | Ultraswim 33.3

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UltraSwim33.3 is now accepting registrations for their 2025 open water events!

Our partnership with UltraSwim33.3 continues to bring you exclusive access to some of the most well-organized and exhilarating open water races around the globe. With 2024 events nearly fully booked, now is the perfect time to secure your spot for 2025.

Check out the full list of events listed in this article and start planning your next big swim adventure!

2025 Events open for registration:

  • Ultraswim 33.3 - #7Croatia

  • UltraSwim 33.3 - #9Greece

  • UltraSwim 33.3 - #10Montenegro

    For those who aren't familiar, here's a video that shows you what UltraSwim 33.3 is all about:

UltraSwim 33.3 #7Croatia: A Journey Through Hvar Island

📅 When: 16-19 May 2025
📍 Where: Stari Grad-Hvar, Croatia

Get ready to step out of your comfort zone with UltraSwim 33.3 #7Croatia, the ‘Islands’ Edition. This exhilarating event covers 33.3km—the same distance as the English Channel—spread over four days and six swims.

Set on the stunning island of Hvar, known as the sunniest place in Europe, this race offers a perfect blend of natural beauty and challenging open water swimming. The point-to-point racecourse navigates swimmers around the western end of Hvar Island, starting from the historic village of Stari Grad and finishing in the picturesque Hvar Town, passing through secret bays and breathtaking islands along the way.

Hvar Island serves as an ideal venue for both avid swimmers seeking a 33.3km challenge over a long weekend and those looking for a delightful vacation with a rewarding swim event at its heart. The swim conditions promise a range of temperatures, with water potentially heating from 16-17°C to 20°C under the early summer sun.

Conveniently accessible via a fast ferry from Split or Dubrovnik, Hvar Island offers a captivating and easily reachable destination for your next swimming adventure.

Ready to take on the UltraSwim 33.3 #7Croatia challenge?

Don’t miss out on this incredible opportunity to swim in one of Europe’s most beautiful locations.

Sign up now for the 2025 event and secure your spot in this epic adventure.

UltraSwim 33.3 - #9Greece - The "Mamma Mia" Edition

📅 When: 19-22 September 2025
📍 Where: Skopelos, Greece

This event, set on the enchanting island of Skopelos, promises warm water and stunning views, famously featured in the cult film Mamma Mia! Swimmers will navigate a wild and exposed coastline, experiencing varied conditions amidst Greece's greenest island.

The picturesque venue, with its crystal-clear waters and secluded coves, provides a perfect blend of natural beauty and challenging swimming. Participants will stay at the family-run Adrina Hotel in Panormos, preparing to swim past beaches and bays accessible only by sea, including a channel crossing from the nearby island of Alonissos. And of course, whether you love it or not, you’re not going to be able to swim without ABBA’s Mamma Mia theme tune in your head, as we start and finish at a number of the cult film’s set locations.

Scheduled for mid-September, expect warm water temperatures ranging from 22°C to 25°C, ideal for an adventurous swim. Travel is convenient with direct flights to Skiathos (JSI) from several European cities, and twice-daily 40-minute flights from Athens via SkyExpress. Arrival at Skiathos airport should be ideally in the early morning or by 14:25 latest on Thursday, September 18th, with departure anytime from 15:00 on the 22nd of September.

Don’t miss out on this incredible opportunity to swim in one of Greece’s most beautiful locations.

Sign up now for the 2025 event and secure your spot in this epic adventure.

#10MONTENEGRO: The ‘Fjords to the Sea’ Edition

📅 When: 3-6 October 2025
📍 Where: Herceg Novi, Montenegro

UltraSwim 33.3 #10Montenegro is the original Epic Adventure Swim Race™ and the founding event of our series. Returning for its fourth time in 2025, this iconic ‘Fjords to the Sea’ Edition promises a thrilling challenge with a country-to-country channel crossing from Croatia to Montenegro.

Swimmers will navigate through an abandoned submarine pen, around a prison island, and the famous Blue Cave, starting the marathon 10km swim if the Adriatic coastline weather permits. Montenegro offers a unique mix of wild mountains, deep fjords, and a rugged Adriatic coastline, producing a variety of conditions perfect for an Epic Adventure Swim Race™. The venue near the entrance to the Bay of Kotor, with accommodations at the Lazure Hotel Spa & Marina in Herceg Novi, provides a stunning backdrop for this adventure.

The course around the Lustica peninsula includes starting inside a giant ‘blue’ cave, a full loop of an old prison island as an untimed section, and a race mark inside an abandoned submarine base from the Yugoslavia era.

Water temperatures are expected between 20-22°C, with occasional patches around 15-18°C due to isolated cold springs, making it suitable for both skins and wetsuits.

Sign up now for the 2025 event and secure your spot before it fills up!

The year 2025 is marked with some very exciting events on the UltraSwim 33.3 Calendar.

These events are known to book up quick, so make sure to book early and get ahead of the game while you're early.

Click here to see more information

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