10 am-5 pm open all year long, including holidays. I copied this from their website: Hours and Location The Conservatory is open 10 a.m. to 5 p.m. daily, including all weekends and holidays. There are extended hours for some programs, please check the Programs and Events page for details. The Conservatory is located at 100 Maryland Ave SW, Washington, DC 20001. The National Garden is open 10 a.m. to 5 p.m. daily, including all weekends and holidays. It is adjacent to the Conservatory, with entrances from Independence Avenue, from Maryland Avenue (at 3rd Street) and from the Conservatory Terrace. The National Garden has extended evening hours staying open until 7 p.m. from Memorial Day until Labor Day. Bartholdi Park is open from dawn to dusk, daily, including all weekends and holidays. It is located across Independence Avenue from the Conservatory, with access from any of the three bordering streets - Independence Avenue, Washington Avenue or First Street.
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