UPS observes some government holidays. Do they deliver on Thanksgiving Day? What about the day after, November 24? According to the official UPS calendar, the answer is yes and no. UPS does not deliver on Thanksgiving, but they do deliver November 24. After that, it's business as usual until Christmas Day, on Monday, December 25. They will again be closed on Monday, January 2 to observe New Year's Day, which falls on a Sunday this year.
UPS gets extremely busy around the holiday season. And while they are not closed much leading up to Christmas, they do have a different year-end schedule. View it here.