A mounting system and method for security screens for use with double-hung windows and other windows having an integral screen track is disclosed. The mounting system and method according to the present invention reduces materials cost for manufacture of security screens while improving aesthetics of the installation and allowing installation to be accomplished from the interior side of the window, and permits installation of security screens either at the construction site or during window manufacture, while preserving the window manufacturer's warranty. Exemplary embodiments both with and without a subframe are described.