A window guard is provided for a window which may be removably mounted in a window frame to protect the window from storms. The window includes a window frame having frame members, two of which have holes formed on inwardly facing surfaces. The window guard includes a board sized to fit within the window frame and a brace or mounting mechanism pivotally mounted on the board which cooperates with the window frame holes to mount the window guard in the frame. The mounting mechanism includes a cross-member pivotally secured to the board and rods telescopingly received in the cross-member. The cross-member is made of two elongate pieces which are pivotally connected and which have blind bores formed in their ends which telescopingly receive the rods. The rods can thus telescope to a position in which they extend from the cross-member into the holes formed in the window frame and be retracted to a position in which they do not extend beyond the edges of the board. A screw is provided for each rod to be screwed against the rod to secure the rod in a desired position in the cross-member. Guide brackets are positioned near the edges of the board to provide a guide through which the rods extend.