This study was conducted at the Demonstration Farm of Fuculty of Agriculture , Kassala University during 2014/2015 and 2015/ 2016 seasons in the Halfah Elgadidah, Sudan. Randomized complete plot design with four replications was used in this study. The treatments were four sowing dates (S1, S2, S3 and S4) corresponding to 1rst Nov,15th Nov, 1rst Dec and 15th Dec and two diverse sesame cultivars “Promo” V1, Um shagara V2. The main objective of this study is to investigate the effects of sowing dates on morpho-phonologial traits and seed yield in two sesame cultivars. The obtained results showed that V2 possessing higher stem diameter, larger leaf area, higher number of fruiting branches and capsules per plant as well as seed yield as compared with V1. Sowing dates significantly influenced the different morphological attributes in this study viz, plant height, stem diameter and leaf area. Most of these characters were significantly higher when sesame sown during 15th Nov but the highest leaf area was achieved in last sowing date. Among the varying dates of sowing S2 and S3 significantly recorded higher number of fruiting branches and capsules per plant as well as seed yield as compared with first and last sowing dates. It may be inferred that Umshagra cultivar can be adopted and recommended in study area during S2 and S3 if grown as irrigated crop.