The best time to go to Zmijavci is during the late spring (May to June) or early autumn (September to October) when the weather is pleasant for outdoor activities and the crowds are smaller.
These shoulder seasons offer warm, sunny days superb for exploring the natural beauty of the region, such as the nearby Blue and Red Lakes, without the intense heat and larger tourist numbers of July and August. You'll find it easier to book accommodations and experience local life at a more relaxed pace.
For families, late spring is particularly good as the temperatures are comfortable for children to enjoy outdoor excursions, and many local attractions begin their full operating hours. The conditions for swimming in the Adriatic Sea, which is a short drive away, are also quite agreeable during these months.
Couples looking for a peaceful getaway will appreciate the romantic setting in early autumn. The vineyards are often in harvest, offering opportunities for wine tasting, and the evenings are mild enough for al fresco dining.