I did some research about this topic for a variety of providers of car hire companies in Europe.
Checking through the terms and
and Generally NOT allowed to:
(opens in a new window) was a little bit different with regards to cross border travel into Croatia:
Hertz vehicles CANNOT be driven into and/or dropped off in any African, Asian, or Middle-East countries, nor in Albania, Armenia, Azerbaijan, Belarus, Bosnia-Herzegovina, Bulgaria, Czech Republic, Estonia, Georgia, Greece, Hungary, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Macedonia, Malta, Moldova, Montenegro, Poland, Romania, Russia, Serbia, Slovakia, Tajikistan, Turkey, Turkmenistan, Ukraine, Uzbekistan.
Hertz vehicles MAY be driven into and dropped off in Austria, Belgium, France, Germany, Luxembourg, Netherlands, Portugal, Slovenia (Ljubljana only), Spain, Switzerland, United Kingdom (islands not included).
Hertz vehicles CANNOT be driven in any of the East European countries with the exception of Croatia where the transit may only be allowed with written authorization from the rental location. The authorization form will be given at the time of pick-up and attached to the rental agreement.
Hertz vehicles MAY NOT be taken on ferries from any Italian Harbour with destination Croatia.
I did find a car rental company called Kemwel (kemwel.com) and while searching through their cross border driving policies from rentals in Italy I found that they state they have a special program with it's suppliers that will allow for travel into select Eastern European countries (Albania, Belarus, Bosnia, Bulgaria, Croatia, Czech Republic, Estonia, Greece, Hungary, Latvia, Lithuania, Moldova, Poland, Romania, Russia, Serbia, Slovakia, Slovenia, Turkey & Ukraine) with additional charges and restrictions. They state that the extra fees are normally add an extra 20% to 30% more to your rates, but can vary by location.
I hope this information was useful to you and good luck with your trip!
*Note: Car rental companies can modify policy at any time; I make every attempt to maintain up-to-date info, but always check with an individual company to verify any policy. See: Disclaimer
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