The country offers things to do year-round so the best time to visit depends on what you plan to do during your stay. Ljubljana is vibrant the whole year through. Many visitors want to head straight for the coast. Those in search of sea, sun, and all-night parties will find what they're looking for in peak season (July and August), including cultural events, open-air dancing, busy restaurants, and crowded beaches. If you want to avoid the crowds, hit the Adriatic in June or September, when it should be warm enough to swim and easier to find a place to put your beach towel.
In the mountains there are two distinct seasons: winter is dedicated to skiing; summer to hiking, rafting, and biking. Some hotels close in November and March to mark a break between the two periods. Conditions for more strenuous walking and biking are optimal in April, May, September, and October, although the summer in Slovenia is seldom as uncomfortably warm as it is in neighboring countries.
Lovers of fine food and wine should visit Slovenia during fall. The grape harvest concludes with the blessing of the season's young wine on St. Martin's Day (Nov. 11). In rural areas autumn is the time to make provisions for the hard winter ahead: wild mushrooms are gathered, firewood is chopped, and koline (sausages and other pork products) are prepared by hand.