Abstract: An improved rock windrower which includes a frame assembly, a reel adapted to be rotated within the frame assembly and having a plurality of windrowing teeth extending therefrom. The frame and reel are adapted to be angularly disposed relative to the draft direction of a towing vehicle. The improved windrower features disposition of the implement teeth in a direction substantially parallel to the draft direction of the towing vehicle upon impact of the teeth with the ground. Such an angle results in a full opening between adjacent teeth which in turn permits cleaner rock windrowing and further provides additional strength. Another feature of the improved windrower includes the provision of a pair of wheel assemblies that are angularly disposed in the draft direction of the towing vehicle and which may be placed at any desirable position on the rear frame of the windrower during a windrowing operation by means of a pair of easily secured bolt hole plates.