Why Romania's seasons matter more than you'd think.
Three things make timing in Romania surprisingly consequential. First, the Carpathian arc carves the country into climatic zones that behave very differently in the same week. Bucharest in July is a 35 °C heat-and-humidity slog through the Wallachian plain; Brașov in the Carpathian valleys an hour and a half north is 25 °C and breezy; the high ridge of the Făgăraș mountains is 12 °C with afternoon thunderstorms. A summer trip that combines all three needs to lean into morning starts and afternoon mountain retreats. Second, two of Romania's most famous drives, the Transfăgărășan (DN7C, climbing the Făgăraș range to Bâlea Lake) and the Transalpina (DN67C, crossing the Parâng range), are seasonal roads. Both are typically closed from late October or early November through late June or early July depending on snowpack, and Romania's national road authority publishes the opening dates each year. The Transfăgărășan in particular is one of Europe's defining drives, and missing the open window is the single biggest planning mistake foreign visitors make. Third, the Black Sea coast has its own short, intense window: Romanian seaside resorts (Mamaia, Constanța, Vama Veche) are basically dormant from October to May and explode with crowds and prices in July and August. Add the Orthodox calendar (Easter shifts independent of Western Easter, often a week or two later) and Romania's particularly atmospheric Christmas/winter festival cluster, and you have a country where what month you visit changes the trip more than in most of Europe.