Yes, they are open again (closed every January but reopen every February 1st) and are open 7 days per week. They will be open.
The grounds itself are open, the building might be closed.
Yes. From website: January: Closed Feb.-May: 10am-4pm Daily June-Labor Day: 10am-5pm Daily Sept.-Dec.: 10am-4pm Daily Nov. 16-18: Closed Thanksgiving Day: Closed Christmas Day: Closed
I would suggest checking their website
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