Can I give a notice to vacate for a month to month lease on 7/6?

[Jennifer Rysdam]

Or do I have to wait until the end of the month? I'm just tired of this guy. He's rude to everyone, including me, and now I was told he's smoking pot in the building an others can smell it. Do I have to wait until July 31st to give him a notice to vacate or can I do it tomorrow to vacate on/by Aug. 5th? I'm thinking I can't but I thought I'd ask. I'm in MN and he's on a month to month lease. Thanks!