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https://www.usna.usda.gov/visit/hours-and-directions/
Hours The outside grounds of the U.S. National Arboretum (USNA) are open daily to the public from 8 a.m. to 5 p.m. The National Bonsai & Penjing Museum is open daily from 10 a.m. to 4 p.m.
https://arb.umn.edu/plan-your-visit/hours-admission
Arboretum General Admission (Daytime) Hours: Buildings open 9 a.m.-4 p.m. daily; grounds open 8 a.m.-5 p.m. through Nov. 17 8 a.m. to 4 p.m. Nov. 18-Jan. 2. The Arboretum is closed on Nov. 25 and Dec. 25. Winter Lights Hours (Oswald Visitor Center [including Cafe and Gift and Garden Store], Snyder Building and Grounds) 5-9 p.m. Monday-Thursday
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