Autumn/Shoulder Season (September through November)
If you enjoy vibrant autumn foliage, Slovenia’s rivals even that of New England. Lake Bled is spectacular year-round but it may be even more extraordinary now, when the sapphire and emerald waters of the lake are framed by golden leaves set against the snow-capped Alps. The larch trees in the mountains will be brilliant in their bright shades of orange, yellow and red. The days will still be pleasantly warm through September, in fact it will still be warm enough to swim, though cooler temperatures will be blowing in during October and November, with a higher chance for rainfall. Hotel rates will be reduced, and the crowds of summer are now diminished.
Mid-September to mid-October is one of the best times to visit Slovenia, especially for hiking in Triglav National Park where you’ll see lots of colour. Wine enthusiasts can enjoy touring the wine estates and picturesque vineyards during the harvest season, and everyone can enjoy shorter lines when visiting the major attractions, especially the medieval castles.
Winter/Low Season (December through February)
If you like the idea of a snowy wonderland, Christmas markets, and skiing in the Alps, you’re guaranteed to fall in love with Slovenia during the winter. While the coast will be mild and fairly comfortable, the alpine regions get lots of snow and are often bitterly cold. There are many outstanding ski resorts in the Julian Alps that are far less visited than those you’ll find in the Swiss, Austrian or other alpine areas of Europe, without the high prices. If you don’t ski, it’s a great time for ice skating, snowshoeing and sledding too.
While crowds peak again around the holidays, throughout much of the winter there will be few tourists around, lines will be almost non-existent and hotel rates will be at their lowest of the year. Just plan to bring your cold weather clothing, bundle up and enjoy.