New Year's Day, known as Año Nuevo in Spanish, is one of the most widely celebrated holidays in Argentina. It's observed on January 1st, thus marking the beginning of the new year in accordance with the Gregorian calendar. The celebration of this day is characterized by family gatherings, sumptuous feasts, and elaborate firework displays that light up the night sky. Tradition holds that Argentinians prepare and enjoy a special meal featuring lentils, which are believed to bring prosperity in the new year.

In Argentina, New Year's Day is considered a public holiday. This means that majority of businesses, schools, and government offices are closed, allowing individuals to spend the day with their loved ones. Many people also attend church services to give thanks for the past year and pray for blessings in the upcoming year. Additionally, people participate in public celebrations such as concerts and festivals that often feature traditional music and dance. Midnight sees the skies lit up by fireworks displays, which is a common sight throughout the country.

New Year’s Day in Argentina is associated with various customs and traditions. The popular custom involves people throwing buckets of water out their windows to signify renewal and purification for the new year. Another tradition is wearing new and brightly colored underwear on the night of New Year's Eve, as it's said to bring good luck. Pink is thought to attract love, while yellow is believed to bring prosperity. Moreover, as the clock strikes midnight, people toast with a glass of cider and make wishes for the New Year, creating a sense of unity and hope amongst the celebrators.