The mesospheric zonal and meridional winds over Saskatoon (52 ¿N, 107 ¿W) show significant QBO (quasi-biennial oscillations), with periods of 2.01, 2.42, 2.30, 2.37, and 2.31 years at 94, 91, 88, 85, and 82 km, respectively, in the meridional (north) component and 2.51, 2.88, 2.52, 2.29, and 2.61 years in the zonal (east) component, mostly not matching with the QBO (~2.50 years) of equatorial stratospheric winds. Also, significant higher periodicities (~4 years) are seen in the mesospheric winds, indicating that QBO and higher periodicities in the midlatitude mesosphere could be highly distorted forms of stratospheric wind QBO and/or may have altogether different origins (e.g., El Nin¿o-Southern Oscillation effects). ¿ 1999 American Geophysical Union