Interesting bird. It looks to be a 2nd year (1st spring) male, but the bill looks uniformly pink, which is odd for a Black-headed Grosbeak. They typically have darker bills, with the top mandible darker than the bottom.
I´m not familiar with Black-headed G. just wonder about the tail lenght at this bird. Doesn´t it look very short?
I think it may be a 1st summer / 2nd calender year male Rose-breasted. Apart from the all pale bill the uppertail coverts ( if I'm reading the photo correctly ) are bright white. They would be orangey brown / orange on Black-headed. The chin and throat also appear to be black, it's only the chin on Black-headed.