From post #2:
First, their twitter page says notification electronically by March 1.
Then their admitted students FAQ https://admissions.umd.edu/explore/freshmandecisionfaqs.php has it answered twice in the same document, once March 1, once April 1.
And then their merit scholarships page says mid March. https://www.admissions.umd.edu/finance/freshmanscholarships.php
Given the different dates, I’d call.