Stage of seed development at harvest time influence both of  canola seed yield and seed quality after harvest as well as seed storability. Two field experiments were conducted at the Farm of El-Serw Agricultural Research Station during 2007/2008 and 2008/2009 seasons, while storage study was conducted at Seed Technology Unit Lab. (ARC) Mansoura, Dakhlia Government, under normal conditions during 2008/2010 and 2009/2011 seasons (from 31 July 2008 till 31 January 2011). The aim of this study was to investigate the effect of four harvesting dates i.e. 75, 82, 89 and 96 days after beginning of flowering on seed yield and seed quality, directly after harvest as well as after 6 and 18 months from storage. The results revealed that harvested canola seed early after 75 days from beginning of flowering had low seed yield and slight 1000-seed weight, high seed moisture contents. Prolonging harvesting date increased seed yield/plant, 1000-seed weight, germinability as measured by (germination percentage, accelerated after seed aging and germination rate) and seedling vigor as measured by (seedling length, seedling dry weight). Meanwhile, increasing the period from beginning of flowering to harvest decreased seed moisture content, mean germination time and electrical conductivity of seed solution. On the other hand, increasing storage period reduced germinability and seedling vigor. Meanwhile, increasing storage period increased mean germination time and electrical conductivity of seed solution. In conclusion, Under the experiment conditions seed yield and seed quality characters can be achieved through harvesting canola seed var. (Serw 4) after 82 to 89 days from beginning of flowering.