The study evaluated the effect of different planting dates on the yield and yield components of six improved cowpea varieties in three locations (Makurdi, Abuja, and Zaria) and three cropping seasons (2019-2021) within the Guinea Savanna Agro-ecological zone of Nigeria. A split-plot design was used for the experiment. Treatments consists of planting dates as the main plot, varieties as subplots with three replications. All data were analyzed using SAS (SAS Institute, 2003). Results showed significant location and variety effects on all the measured traits. The year effect was also significant for measured traits. Planting date significantly influenced on all measured traits except 100-grain weight. The interaction of these sources of variation (Year, Planting date Variety, and Location) had significant effects on yield components. The 3rd planting date (29th August) produced the highest seed yield for all the varieties except IT89KD-288, which recorded the highest seed yield at the 2nd planting date (22nd August). Contrarily, in Makurdi and Zaria, the first date of planting (15th August) produced the highest seed yield for all the varieties, except for IT99K-573-1-1 and IT89KD-288, which recorded the highest seed yield at the 2nd and 3rd planting dates, respectively. It is therefore important that adequate predictions regarding accurate weather conditions are well disseminated to the farmers before onset of farming seasons to guide them appropriately on suitable planting time to obtain optimal yield in cowpea production to boost food security.