Driving from Podgorica to Dubrovnik
Dubrovnik is the classic day trip abroad from Montenegro, about 145 km and two and a half hours via the Bay of Kotor and the Croatian border. It is one of the most scenic drives in the region, though the crossing and the paperwork need planning. If you are still deciding, start with what the cover has to include.
The route to the border
The road runs to the Bay of Kotor and around or across it, past Herceg Novi to the Croatian border at Debeli Brijeg. From there the Adriatic Highway hugs the coast to Dubrovnik. The bay stretch is the slow, scenic part; the coast beyond the border is faster.
Crossing into Croatia
You need the cross-border Green Card to take a rental into Croatia, arranged at booking, plus your passport and the car's papers. Croatia is in the EU and the Schengen area, so the crossing is a passport check, though the paperwork each Montenegro border crossing wants varies by country. Summer queues at Debeli Brijeg can be long, so go early.
Parking at Dubrovnik
Dubrovnik's old city is walled and car-free, and parking nearby is expensive and scarce in season, so use one of the signed garages and walk or take the shuttle in. A smaller car is easier and cheaper to leave. Returning the same day is simplest, since ending a rental in Croatia is not offered.
Timing a day trip that works
This is a long day however you organise it: around two and a half hours each way before the border, and the border is the part that decides whether the day feels generous or rushed. Debeli Brijeg is quick out of season and can be slow in July and August, particularly late morning when everyone has had breakfast and set off. Crossing early, walking the walls before the heat and the cruise crowds, and starting back in the late afternoon is the shape that works. Trying to fit it around a lie-in generally does not. If you would rather not drive it twice in a day, breaking the trip at Herceg Novi on the way back turns a hard day into an easy two.
Which car makes this day easier
A compact, for the same reason it wins on the coast generally: the garages in Dubrovnik are tight, expensive and priced by size, and the bay road on the Montenegrin side is narrow enough that a big car is a chore rather than a comfort. Most of the pool is automatic, which is welcome on a route with this much town driving at both ends. The listing names the exact model and carries its own photographs, so you can judge the boot for a day out rather than a fortnight's luggage. Mileage is not usually the constraint at under three hundred kilometres for the round trip, though most cars come with no cap in any case.
Cover, the deposit and the paperwork you carry
The cross-border cover has to be arranged at booking, because the document travels with the car and cannot be produced at the barrier. Beyond that the terms are the normal ones: free Minimum third-party liability on every rental, then Basic, Full and the no-deposit Full Plus as paid tiers priced per car at checkout. Driving in a second country is the wrong trip to take the thinnest cover on, if only because a claim raised abroad takes longer to settle whatever the paperwork says. Most cars hold a refundable deposit on a card at pickup, some carry none, and most cars need no credit card. Take your licence, your passport and the car's papers, and remember the rental has to come home with you, since a Croatian drop-off is not offered. Keep the rental agreement and the cross-border document in the car rather than in a bag in the boot, because both are asked for at the barrier and neither is worth unpacking for in a queue. If two of you are driving, add the second driver when you book: a day that involves two border crossings and five hours behind the wheel is exactly the trip where swapping over matters, and a driver who is not named on the contract is not covered whatever tier you took. It is also worth photographing the car before you set off, since a long day on unfamiliar roads is when small marks appear and you want a record of what was already there. Plan the return leg as carefully as the outbound one. The queue at Debeli Brijeg going back into Montenegro is a separate event from the one you sat in that morning, and it is often at its worst in the early evening when every other day-tripper is doing the same thing. Leaving Dubrovnik an hour earlier than feels necessary is the difference between dinner in Herceg Novi and a late crawl back to the capital. Your deposit, meanwhile, stays held until the car is returned, so a border day does not change anything about how that works. Keep the paperwork in the car for the return crossing too: the same documents are checked in both directions, and a bag in the boot is the wrong place for them at a barrier.
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