Indian economy is an emerging economy, but it is still an agricultural economy because here, most people earn their livelihood from agriculture. The present study for temporal changes in Rajasthan time series, data on area, production and yield per hectare of oilseed and cash crops were collected from 1976-77 to 2018-19. Rajasthan state as a whole was selected for the study. The time-series data were collected on area, production, and yield of selected four Rajasthan crops from the Directorate of Economics and Statistics (DES), Directorate of Agriculture (DOA) and Rajasthan State Agriculture Department. The crops included were sesamum, soybean, rapeseed & mustard and cotton. The area under selected in Rajasthan changed remarkably from 1976-77 to 2018-19. The area under sesamum was reduced, which was shifted towards pulses, oilseeds and cereal crops like moong, urad, soybean, rapeseed & mustard and wheat. The area under soybean, rapeseed & mustard and cotton, had increased during the study period. During the study period, the average total production and yield increased to unprecedented levels in all the selected crops. The area under sesamum reduced during the study period. Therefore, technological support through varietal improvement and extension support is required.