Skip the car
Major-city itinerary, city breaks, travelling between central railway stations, staying in historic centres.
For most first-time city itineraries, you can skip the rental car. But some parts of Poland are dramatically easier to explore with one.
SHORT ANSWER
If your itinerary is mainly Warsaw, Kraków, Gdańsk, Wrocław, Poznań and other major cities, trains plus local public transport are usually easier. A car becomes much more useful for countryside, small towns and nature-heavy trips.
Major-city itinerary, city breaks, travelling between central railway stations, staying in historic centres.
Mazury, Podlasie, remote countryside, small villages, dispersed attractions or a route with many rural stops.
WHEN A CAR HELPS
A car can become a burden because you still need parking and will often use trams, buses or walk once you arrive.
Long-distance trains connect the main tourist cities, often from centre to centre.
A car gives you much more flexibility when attractions are spread out and local transport is infrequent.
For luggage, child seats and several rural stops, a car may be worth the extra logistics.
Know the Polish motorway toll system and the basic speed limits. Not every motorway is paid, and the rules are different for ordinary passenger cars and vehicles above 3.5 tonnes.
FAQ
No. For a typical first-time itinerary through major cities, trains and city public transport are usually enough.
It is most useful for rural areas, lake districts, small towns, remote attractions and multi-stop countryside trips.
Often not. A good compromise is to travel between major cities by train and rent a car only for the rural part of the trip.