Sweet corn is a variety of corn with high sugar content used as human food at the milk stage. The information on general combining ability and specific combining ability for sweet corn inbred lines are important for hybrid development. The objectives of this study were to estimate general and specific combining ability effects and identify superior sweet corn hybrids for eating quality and fresh yield. Experimental entries consisted of 38 sweet corn hybrids developed from crossing 19 sweet corn inbred lines with two sweet corn testers in a line×tester mating design. These hybrids were evaluated at two plant dates; early at 22nd of April and delayed 6th of August in two separate experiments at Sakha Research Station 2018 season. Data recorded on days to 50% silking, plant height, sweetness, fresh yield with and without husk, ear length, No. of rows/ear and No. of kernels /row. Combined analysis of variance showed that the means of early planting increased significantly than delayed planting date for all studied traits. The non-additive gene effects were more important than additive gene effects for sweetness, fresh yield with and without husk, ear length, and No. of kernels /row. While the additive gene effects were predominant in the expression of days to 50% silking, plant height and No. of rows/ear. The best inbred lines for general combing ability effects were Sk307, Sk316, Sk318 and Sk319 for most traits. The sweet corn hybrid Sk307×Sk321 was superior for sweetness, fresh yield with and without husk and No. of rows/ear.