April 1st Magic Mountain Opens to California Residents Only. You also need to make a reservation on their website.
Some one said April 1st
At the beginning of April
They have re-opening day set for April 1st and 2nd for passholders and daily starting April 3rd last I heard. Otherwise, unless it's for a special drive through event, they have been closed.
April 3
Thanks! Your answer is awaiting moderation.