Blue Cave in April: An Honest Guide to the Opening Weeks

Officially we say the season starts on 1 April. In practice the cave authority on Biševo opens between 15 and 25 April most years — earlier in mild winters, later when March has been stormy. We run partial routes (Blue Lagoon, Brač) before the Blue Cave itself is accessible, but the full 5-island tour with cave entry begins when Biševo opens.

If you are travelling in early April, we will tell you honestly when you book whether the cave is realistically going to be open on your date. We do not take bookings for tours we do not believe will happen.

The crossing to Biševo in April is the most variable of the year. A good week brings glassy mornings and 19-degree air. A bad week brings 25-knot Jugo and three days of cancelled tours. The Adriatic in April is still transitioning out of winter and the forecast can flip in 12 hours.

Practical implication: build flex into your Split itinerary. If you want to do the Blue Cave in April, give us at least two possible dates within your trip. If the first date is windy, we shift to the second. This is standard early-season practice and most guests find it works fine.

Sea temperature in April is 15 to 17 degrees. That is cold. Strong swimmers from the UK, Scandinavia, and northern Germany will jump in cheerfully. Most other guests will dip and get out fast.

You do not need to swim. The cave itself is a 10-minute visit in a rowboat where you stay dry. Stiniva, Budikovac and the Pakleni are still worth seeing from the deck even if you do not get in. But if you came specifically for swimming, April is the wrong month.

No crowds. The Blue Cave queue in April is two or three boats. Compare to mid-August when it can be twenty. Stiniva, the most photographed beach on Vis, can be entirely empty in April — a thing that simply does not happen in summer.

Hvar piazza in April is a different town. Locals are still in it. Konobas are open but quiet. You can have lunch on a terrace with a view of the harbour without booking ahead. The light is sharp and the sea is the deepest blue of the year.

For photographers, history-curious travellers, and anyone who finds high season exhausting, April delivers a version of the route that summer crowds make impossible.

A proper warm layer for the crossing. A windbreaker over a fleece — not just a light cotton shirt. The wind chill at 23 knots in 17-degree air feels like 8 to 10 degrees on the open deck.

A wool hat or beanie for the return crossing. Sounds excessive in April Croatia — it is not. The wind off the open Adriatic in late afternoon is genuinely cold.

Long trousers and closed shoes for the boat. Save the shorts and sandals for once you are ashore at Hvar.

Photographers, retired travellers with flexible itineraries, off-season specialists, and anyone who actively dislikes crowds. Couples doing a romantic, slow trip with a hire car and no fixed schedule.

Anyone who can build two possible dates into their Split trip in case of weather. Anyone for whom the cave and the route matters more than the swimming.

Families with small children — the cold water and exposed crossing are uncomfortable. Pick June or September instead.

Anyone with one fixed date in their trip and zero flexibility. The April weather risk is real and a closed cave with no alternative date means a disappointing trip.

Beach-and-swim travellers. You will be looking at the water more than you will be in it.

Further reading: see also our by-month Blue Cave comparison, the low-season April-October-November piece, the weather reschedule explainer, and the what-to-wear by month guide. Book at /tours/blue-cave-5-island-tour.