Yes it is lit every day from 5:30 am to 11:30 pm. But check the details here https://www.rockefellercenter.com/blog/2018/11/08/2018-rockefeller-center-christmas-tree/
2 conflicting answers from 2 local guides.I will take the one from Etela Ivkovic being deemed sure w/ her info
I believe it's not.
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