Postojna Cave

Slovenia is one of the most charming destinations in Europe, with fairytale good looks in medieval towns, the stunning snow-capped Julian Alps, turquoise rivers, sapphire lakes, and plenty of historic sites. With over half of its surface covered in forest, it’s one of the greenest countries in more ways than one. Plus, outdoor adventure abounds with opportunities to hike, bike, kayak, raft, explore on horseback, or ski, while providing a fascinating mix of Slavic, Italian, and German cultures that can be tasted in the mouthwatering cuisine.

The jaw-dropping Postojna Cave system, a series of caverns, halls and passages some 24km long and two million years old, was hollowed out by the Pivka River, which enters a subterranean tunnel near the cave’s entrance.

Visitors get to see 5km of the cave on 1½-hour tours; 3.2km of this is covered by a cool electric train. Postojna Cave has a constant temperature of 8°C to 10°C, with 95% humidity, so a warm jacket and decent shoes are advised.

The train takes you to the Great Mountain cavern, on a trip that’s like entering the secret lair of a James Bond villain. From here a guide escorts you on foot through tunnels, halls, galleries and caverns in one of four to six languages (audioguides are available in many more tongues).

These are dry galleries, decorated with a vast array of stalactites shaped like needles, enormous icicles and even fragile spaghetti. The stalagmites take familiar shapes but there are also bizarre columns, pillars and translucent curtains that look like rashers of bacon.

When to visit Postojna Cave

Summer is by far the most popular time to visit Slovenia although it won’t be as crowded as compared to many other Mediterranean destinations. This is a lovely season to enjoy Ljubljana with its outdoor cafes and picnics along the Ljubljanica River. It’s also ideal for swimming in Lake Bled and rafting the Soca River, with temperatures in the region that can climb to the upper 80s. That said, the foliage in autumn rivals even that of New England while the air is crisp and cool. Early fall is a wonderful time for hiking in the mountains and sightseeing.

Postojna Cave FAQ


Matilda Your Croatia Expert

How many days do you need in Slovenia?

While it’s possible to fit the two most popular destinations, Ljubljana and Lake Bled into a 2-day trip, you really need at least four days to discover the highlights, including classic spots like Predjama Castle and Triglav National Park. A week will give you time to explore them all at a pace that isn’t as rushed. You can visit the capital as well as Lake Bled and Lake Bohinj before making your way to the Soca Valley to zip-line through canyons or raft the Soca River. The Brda wine region, caves, castles, and even the coast can be visited too.

What is the best time to visit Postojna Cave?

The best time to visit Postojna Cave is in the morning. An early spot for a cave tour means it’s less crowded with fewer tourists. Summer season is always busy. Try to be there in fall, winter, or spring if possible.

What are the essential sites to see in Slovenia?

While the mountains and other natural attractions are a must, you won’t want to miss the sites in Ljubljana like Ljubljana Castle which has stood atop Castle Hill for over 900 years overlooking the city. Lake Bled is another top spot, including the islet at its heart that’s topped by Our Lady of the Lake Church – rent a rowboat to explore it. Predjama Castle, uniquely set within the mouth of a cave midway up a cliff, and the Skocjan Caves are two of the other not-to-be-missed highlights.

Is Slovenia worth visiting?

Despite being an under-the-radar destination, and perhaps partly because of that, Slovenia provides an unforgettable escape with great diversity. It may be small, but it has an incredible range of landscapes from stunning coast and flat plains to deep caves and the high peaks of the Alps. Visitors rave about its glacial lakes, charming medieval towns, vineyard-covered hills, and storybook castles too. From exploring history to taking part in thrilling activities like zip-lining, it offers something for everyone.

Our Postojna Cave Tour Packages

Explore Croatia and Slovenia – 8 Days

Enjoy the best of Slovenia and Croatia! Visit the magical underworld in Postojna, admire emerald lakes Bled and Plitvice national Park, taste local flavours of Istria!

Half Day Trogir Food & Wine Tours

Experience magnificent Trogir on this half-day trip. Discover the diverse flavors of Dalmatia and its regions through wine.

Hvar & Pakleni Islands Private Boat Trip

Discover Hvar and Pakleni islands on this exclusive private boat tour. Feel like a VIP for a day and let our crew take you to the top locations in Dalmatia!

Best of Croatia: Zagreb to Dubrovnik – 12 Days

Dare to discover the captivating nature of Croatia and travel through the incredibly turbulent history of the coastal cities. Enjoy this complete 12-day itinerary covering the Best of Croatia from Zagreb to Dubrovnik.

Catamaran Cruise Croatia

Spacious, bright, and high-performance Lagoon 450F offers all enjoyment on the sea, whether sailing or at the anchor.Together with its crew, it will bring you to complete relaxation combined with comfort and safety.

Elegance south cruise from Split with M/S Invictus

Sailing from one island to another in the southern Adriatic Sea will introduce you to the secrets and mysteries of the Croatian coast, home to a thousand islands and beautiful cities and their rich history.

Pilgrimage to Medjugorje – 8 days

The Medjugorje Tour is ideal for Catholic pilgrims and those wanting to connect with their faith. It is visited by millions of people from all around the world during the year.