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Smithsonian museums are open every day of the year except December 25 unless otherwise noted.
Museums extend their hours on certain dates as noted on the calendar below.
NASM (National Air and Space Museum)
NMAH (National Museum of American History)
NMNH (National Museum of Natural History Museum)
UHC (National Air and Space Museum Udvar-Hazy Center)
Note: The American Art Museum and Portrait Gallery are open every evening until 7 p.m.