Abstract: A cover encompasses a hydrant having a bonnet mounted atop an upper barrel having two flanged ends. The cover has a domed annular hood shaped to correspond to the bonnet. The cover also has an externally convex skirt depending from the annular hood. This convex skirt is sized to overlay and underlie one of the flanged ends of the upper barrel to encase it. The cover may include an axially seamed, tubular jacket and positioned to meet the convex skirt from below. This jacket is sized to encompass the upper barrel of the hydrant. An optional tubular boot can encircle the barrel between one of its flanged ends and the jacket.