a snow plow deflector for a straight snow plow blade is provided including a center section having a plurality of spaced - apart recesses formed therein , and two outer sections , each also having a plurality of spaced - apart recesses formed therein , wherein each of the outer sections are positioned to align with opposite side edges of the snow plow blade , respectively , with the center section secured thereover such that the recesses of the center section interfit and seat within the recesses of the outer portions and secure thereto . the plurality of recesses provided along the width of each deflector section permits the overall width of the deflector to be adjusted to fit a variety of snow plow blade widths .