It depends on the year, but typically the holiday decorations start to go up in late November or early December. The most popular spots to see the Christmas decorations are Times Square, the Rockefeller Center tree, and Fifth Avenue. You can also find festive displays at department stores like Macy's and Saks Fifth Avenue, and smaller shops along the streets. The holiday spirit really starts to take over the city once the decorations go up, so it's always a fun time to visit!