Croatia will be very quiet in Feb and March, possibly also April in places, particularly on the islands. At least 50% of the island population is seasonal, so shops will be closed or reduced hours. Restaurants with
mooring will be closed. There are a lot of good
safe anchorages, but a lot of
mooring buoys will be missing as they only buy the franchise's for the season.
Marinas are in the
cheap season but that is still very expensive, municipal harbours may or may not be manned. Spring particularly March is when the strongest Bora occur so watch the
forecast diligently.
Weather can be very cold, warming quickly in April. Cruising in April is very pleasant as there are few
charter boats and
weather is generally nice.
You will need to be very self sufficient with
water, provisions and
heating.
Fuel is no problem as most stations serve
boats and road vehicles but mostly mornings only.