The Christmas tree in NYC's Rockefeller Center is usually taken down at the end of the holiday season, typically between January and February. The exact date can vary depending on the year, but it usually falls within this range. The process of taking down the tree involves carefully disassembling it and removing all decorations before it can be recycled or reused. The tree is often reused in other ways, such as being turned into mulch for city parks or being donated to local charities for use in their own projects.