The present invention relates to a weatherproof ashtray device having an improved ashtray concealed within a deck post cap. The cap is adapted to be placed on a top end of a deck post and configured to receive the tray or ashtray. The cap has a hinged cover that can be pivotally opened to access the ashtray for use. The ashtray remains secured inside the cap thereby eliminating risk of being knocked off. Further, the cover protects the ashtray from weather elements. The ashtray device enables the deck post to function as normal while offering a place for individuals to discreetly smoke and dispose of their ashes, cigarette butts, and cigar butts. The cap and ashtray are weatherproof to prevent damage due to wind, rain, snow, and other inclement weather.