Maddon has done similar head-shaving events when he managed the Rays. As for his hair, it normally starts sprouting back in April, and by mid May, it looks like he got a military cut.
"By June, I should be back to full force," he said. "My goal is not to get any more haircuts for the year, but then I get ratty and I succumb. If I could truly do this today and go the whole year without a haircut -- I'm not saying I'm going to do that, but that's the goal every time. I've always succumbed."