May and June are the best months to visit, followed by September and early October. At these times, you can visit the medieval painted monasteries in southern Bucovina, and enjoy them minus the tourist hordes. Spring and autumn are also the best times for birdwatching in the Danube Delta. Romania has harsh winters, when tourism is centred on the ski resorts like Poiana Brasov and Sinaia. Snow lingers as late as mid-May and the hiking season doesn't begin in earnest till June. The resorts along the Black Sea coast start filling up in late June and stay packed until mid-August.
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