The effect of various seeding rates and seeding dates on the agronomic performance of four rapeseed genotypes (three advanced mutants and one commercial variety) was studied for two consecutive years. The results showed that seeding rates did not affect plant height but influenced maturity significantly and plots seeded with 4 kg ha-1 matured earlier than rest of the plots. Significant differences in mean values of rapeseed genotypes with respect to physiological maturity were also observed and RM-152-2 matured significantly earlier than rest of the entries. The yield data showed that only RM-182 significantly out yielded the check (Pak Cheen) at different seed rates. Also the yield tended to increase with an increase in seed rate up to 10 kg ha-1, above which a slight decrease was noted. The lowest yields were obtained at the lowest seed rate. The interaction between the seed rates and genotypes was significant at P-1 and sowing between 25 September and 15 October is, therefore, recommended for obtaining higher yields of rapeseed genotypes.