Abstract: The present research was designed to study the combining ability effects of 15 parents of maize (13 inbred lines and 2 testers) crossed in line x tester scheme and assessed for yield and its components. The genetic materials were evaluated using randomized complete block design with three replications in two sowing dates, June, 1 and July, 1 at the experimental farm of Suez Canal University, Ismailia, Egypt in 2009 cropping season. Parents and crosses showed significant differences for all measured traits at both and combined over dates. On the other hand, all measured traits were affected significantly by sowing date (except rows ear-1), parents x SD (except days to 50% silking) and crosses x SD (except ear diameter). Delaying in sowing caused reduction in means of all evaluated traits (except ear diameter and rows ear-1). Line x tester analyses confirmed the preponderance of δ2SCA in controlling the inheritance of the majority of traits relative to δ2GCA. Moreover, the contribution of lines was pronounced in the expression of all traits at both late and combined dates. L6, L7, L8, L10 and L12 were found to be good combiners where they recorded desirable GCA effects for yield plant-1, some of yield components and flowering traits in one or both sowing dates. L10 was distinguished as one which recorded desirable and favorable GCA for earliness, yield plant-1 and its components. In addition to their superiority as combiners, L8 and L12 recorded desirable SCA effects for earliness, ear characteristics and yield plant-1. The previous parents can be crossed with other promising lines to develop early maturing and high yielding hybrids/varieties for cultivating under late sowing.