Both Jensen and Jared have made a habit of eschewing the razor in the three month break between the filming of seasons each year. The beards are generally referred to by fans as "hiatus scruff" although both have been known to sport full mountain men growths. Also termed by some (Australians) as the ranga beard.
When filming for season nine commenced on July 11th, 2013; director Guy Bee posted a video of Jensen's transformation from his usual hiatus-grown beard to Dean. In season nine, Dean's estrangement from Sam in the middle of the season led to Dean's five o'çlock shadow growing longer into what fans budded the "Break-up Scruff" and the "Beard of Feels."
Jensen posted a series of photos, taken by Misha, mapping his transformation from Hellatus Jensen to Dean in Season 12.