A friend was in the area this past weekend (5/5/19) and there was still several feet of snow along Highway 4 in Arnold, elevation 3,999'. Since the Slickrock Trail ranges in elevation from 6724' - 7403' it may be July before it is passable.
A annual trip that I participate in on the nearby Mattley Meadows and Corral Hollow trails has been postponed from mid-June to mid-July due to this year's deep snowpack.