Powder sunscreen is your best bet.

Yes, but not with regular lotion sunscreen. Traditional sunscreen will make your hair greasy unless you’re very careful. The trick is to use a powder sunscreen or a spray designed specifically for the scalp. Powders go on matte, won’t weigh hair down, and actually stay put better in hair than lotions. If you’ve already got a lotion, apply it to a makeup brush or your fingertips and dab it onto your part and hairline, avoiding the strands. Let it dry before touching your hair. Dry shampoo with SPF is another option if you’re lazy.

Don’t skip it—scalp sunburns are miserable and peel like crazy.