Which of these holidays falls during the winter season in the US?

In the United States, people begin to celebrate the New Year on December 31st, New Year’s Eve. Families and friends gather to share a meal and “ring in” the New Year, often with a toast and a song. Americans also enjoy the tradition of watching the New Year’s festivities at Times Square (New York City), which are broadcast on TV. New Year’s Day (January 1st) is a national holiday in the United States.

Source: American English