Croatia itineraries fail on the boats. Of 68 routes in the 2026 register, 17 are commercial lines with no public service obligation, and the convenient Split to Dubrovnik through-service is made of exactly those. Decide your dates first, then the route the dates allow.
Start with the calendar, not the map
Almost every Croatia itinerary you can find online is a July itinerary with the month removed. It works, in July. Move the same sequence to the first week of June and legs of it stop existing — not run less often, not run at awkward times, but stop. The state coastal line register is a public document and it says exactly when each route runs, which is why the dates have to come first.
Three questions decide the shape of the trip: how many nights you have, whether you want sea or streets, and how many times you are willing to pack. Everything else is detail.
Nights you actually have on the ground
What you want out of it
The five-day route →
The tool is a shortcut, not the argument. The argument is below it, and it is the same argument on every one of these pages: the number of nights you have decides how many sea legs you can absorb, and the month decides which sea legs exist.
What each length can actually hold
A sea leg is not a transfer. It is a departure time you cannot move, a check-out that has to happen before it, and an afternoon that belongs to the boat. Count them honestly and the plan writes itself.
| Nights | Bases | Sea legs it absorbs | Realistic shape |
|---|---|---|---|
| 5 | 1 | 0 – 1 return day trip | One city, one island seen and left the same day |
| 7 | 2 – 3 | 2 – 3 | Two islands on the same chain, or one island and the far south |
| 10 | 3 – 4 | 3 – 4 | The southern chain end to end, in high summer only |
The row that catches people is the last one. A ten-day southbound route that works in the middle of July does not exist in the first week of June, and the itinerary posts never mention the difference because they were written once and never dated.
The itinerary you copied was written for July
State line 9807, the catamaran down the southern chain, runs its full route — Ubli, Korčula, Polače, Sobra, Šipanska Luka, Dubrovnik — only between 3 July and 30 August. Off-season it serves Sobra, Šipanska Luka and Dubrovnik and nothing else: Korčula and Mljet's Polače are not connected to Dubrovnik by it at all.
You can see it in the tariff itself. Line 9807 publishes fares for 13 port pairs, and only 3 of them carry an off-season price. There is no off-season Dubrovnik–Korčula fare because there is no off-season Dubrovnik–Korčula sailing.
That is one line. The wider version of the same problem is that 17 of the 68 routes in the register are commercial services with no public service obligation attached. They are run for summer demand and nothing guarantees they exist in May.
17 of 68
routes in the 2026 register are commercial lines with no public service obligation
Which is why this cluster is built the way it is: pick the length first, then read the page for that length, because each one fails differently. Five days fails on ambition, seven on geography, ten on the calendar. If you want the sea legs argument in full, island hopping is the page that carries it, and the ferry network is where the 68 routes are set out one by one.
What to decide before you book
- Fix the dates before the route. The month decides which legs exist. Nothing else in the plan is stable until it is set.
- Count sea legs, not destinations. Each one costs the better part of a day at the front and the back.
- Decide the car early. Only 24 of the 68 routes carry a vehicle, and every fast catamaran is foot passengers only.
- Book the boat before the hotel. Hotels resell. A sold-out sailing on a one-rotation-a-day line does not.
Tell us your dates and we will tell you what runs
Shoulder-season routes are the ones that cannot be checked on a booking site, because the site only shows what is loaded for sale today. We read the 2026 register and the per-line timetables against your actual dates and tell you which legs exist before you book anything.
What do you need to work out next?
You have the shape of the trip. These decide the detail.
Where to stay
Which base does the route need?
Three bases in ten days is the ceiling before the trip becomes packing.
Getting around
How does the ferry network actually work?
68 routes, 24 carrying vehicles, 17 with no public service obligation.
When to go
Which month should I aim for?
September holds the warmest sea of any shoulder month at 21.7 °C in Split.
Planning
Can I string the islands together?
The chain runs south, and the through-boats are all commercial lines.
Ferry data: Agencija za obalni linijski pomorski promet (ZOLPP), 2026 state coastal line register and per-line timetables. Climate data: DHMZ (meteo.hr), climate normals 1971–2000.