Abstract: An experiment was conducted to study the effect of different sowing dates on grain yield and yield attributing components on mungbean genotypes sown during kharif under rainfed conditions. It was observed that delay in sowing caused a substaintial decrease in all the growth and development parameters recorded. Genotypes responded significantly towards the grain yield. Maximum grain yield of 1668 kg ha-1 was produced by advanced breeding line (NCM-209) when sown early in the season (5th July). It was concluded that first week of July was found to be ideal tome of sowing for mungbean and NCM-209 performs better than other genotypes.