May, June, September, and early October are ideal. The weather is warm enough for hiking and swimming in the lakes, and the main sights are less crowded than in midsummer. July and August are the busiest months, especially around Lake Bled, but they’re also the best time for high-altitude hiking and rafting on the Soča River. Autumn brings the grape harvest in the wine regions and golden larch forests in the Alps. In winter, there’s skiing in the Julian Alps, and Ljubljana’s old town fills with Christmas markets in December.

Arrive early in the morning or stay overnight, so you can walk the lakeshore and take a traditional pletna boat to the island church before the day-trippers arrive. Nearby Vintgar Gorge requires advance timed tickets in high season, so it’s worth booking ahead. For a less developed alternative, Lake Bohinj, about 30 minutes away inside Triglav National Park, has forested shores, swimming spots, and a cable car up Mount Vogel.

There are two main options. Postojna Cave is the most visited, with an underground electric train and chambers full of stalactites. It’s also home to the olm, a blind cave salamander. Škocjan Caves, a UNESCO World Heritage Site, are less developed and more dramatic, with a river running through one of the largest underground canyons in Europe. Predjama Castle, built into a cliff face, is a short drive from Postojna and easy to combine with either.

Slovenia sits where Alpine, Mediterranean, and Central European cooking meet. Try štruklji, rolled dumplings with sweet or savory fillings, potica nut roll, and Carniolan sausage. On the coast and in the karst, look for seafood, cured ham, and truffles. The wine country near the Italian border is known for orange wines and crisp whites, while the karst produces a deep red called Teran. Slovenia also has a long beekeeping tradition, and the Soča Valley town of Kobarid is home to one of Europe’s most acclaimed restaurants.

Yes. Triglav National Park in the Julian Alps has well-marked trails, ranging from easy valley walks to multi-day hut-to-hut routes. The Soča Valley offers riverside trails with turquoise pools and waterfalls. The best season for mountain hiking is June to September, when the high trails are clear of snow and the mountain huts are open.

Slovenia is part of the European Union and the Schengen Area, so US citizens can visit for up to 90 days without a visa. The EU is introducing new entry requirements, including digital border registration and a pre-travel authorization known as ETIAS, so your specialist will confirm the current rules before you travel.

Slovenia is easy to pair with its neighbors. Croatia’s Istrian peninsula is about two hours from Ljubljana, and Zagreb is a similar drive. The Italian city of Trieste and the Friuli wine region are just across the western border, and Venice is about three hours away. To the north, Austria is a short drive through the Karawanks mountains.