ABSTRACT Field experiments were conducted during 2017/2018 and 2018/2019 seasons, in two locations of Upper Egypt Governorates. The investigation includes 30 treatments, which were the combination between 5 genotypes, 2 sowing dates and 3 plant spacing treatments. It is obvious from results that sowing pea on 15^th September (D₁) generally gave the Values significantly equal or better than the October sowing date (D₂) for most the vegetative growth traits in all seasons and locations. The plants attained 50% flowering earlier in the wider spacing (S₃) in Qena, than the narrower spacing (S₁, denser plant population) of pea plants which hastened the days to flowering in Assiut. Therefore, it seemed that the influence of plant population on days to flower initiation varies from crop to crop as well as the prevailing environmental conditions under which the crops are grown. Genotypes G₃ attained 50% flowering at 35 days in Qena followed by genotypes G₁ and G₄; the remaining genotypes were late in flowering in both seasons of this location. Significant interaction effects of sowing dates on the performance of studied genotypes were found for number of days to 50% flowering, plant height and number of branches (both seasons) in both Qena and Assiut regions as well as number of leaves at both seasons in Qena and only 2^nd one in Assiut region. It is clearly from the data that the effects of the D×S×G interaction was significant in days to flowering, plant height, branches/plant and number of leaves/plant in both regions and seasons, except in the 1^st season of Qena region for days to flowering. In general, the best interaction in days to flowering (D₁×S₃×G₃& D₁×S₁×G₃) inQena region. While, Assiut region, (D₁×S₁×G₃& D₂×S₃×G₃) in the 1^st season and (D₁×S₃×G₃) in the 2^nd one.