Most of Liechtenstein's customs are drawn from Alemannic culture, with many also closely linked to the Catholic church and its holy days and rites. Customs are spread throughout the year and often mark the start or end of seasons or are even considered seasons in their own right.
The carnival season, referred to as "Fasnacht", is celebrated in Liechtenstein from Dirty Thursday through until Carnival Tuesday and is known as the "fifth season of the year". It is followed by Bonfire Sunday, traditionally the Sunday after Ash Wednesday, when a large pile of wood is set alight to drive away the winter. Liechtenstein's national day, the Prince's Day, is celebrated every year on 15 August. A holy day and a bank holiday in the Principality, it was introduced in 1940 and is closely linked to the birthday of the Reigning Prince at the time, Prince Franz-Josef II, on 16 August.
After spending the summer grazing up on the high pastures, cattle are brought back down into the valley in autumn. This tradition is celebrated every year with small processions of cows being led through the villages with colourful headdresses made of flowers and bells around their necks. Many people gather to watch these processions, which are linked to traditional cattle markets in Triesenberg, Vaduz and Eschen that today take place in the form of fun fairs. Another autumn custom is the wine harvest, known as "Wimmlete". In the vineyards the grapes are gathered with the help of friends and relatives, before everyone settles down over a hearty meal and a glass of wine to reflect on that year's harvest. The highlight of the annual "Wimmlete" is the measuring of the density of grape must according to the Oechsle Scale, an indication of grape ripeness and sugar content. If that year's harvest of Blauburgunder grapes reaches 100 on the Oechsle Scale, the winemakers celebrate by opening a few more bottles. Indeed, if the party is swinging and the wine is flowing then sometimes a score of only 90 is enough to justify a few more glasses.