An interlocking roof tray adapted for placement on a roof surface and including a bottom surface and sidewalls defining an interior region of the tray. A dovetail projection extends outwardly away from the interior region in one sidewall, and a dovetail recess extends inwardly into the interior region in a sidewall opposite the dovetail projection. An interlocking roof tray assembly is formed from a plurality of the roof trays. Adjacent interlocking roof trays are secured together by dovetail joints formed form the dovetail projections and dovetail recesses.
