High temperature reduces the pollen viability and silk receptivity of maize resulting in poor seed set and reduced yield. To identify and select the high temperature tolerant maize genotypes for terai region of Nepal, the field experiments were conducted at NMRP Rampur, RARS Parwanipur and RARS Nepalgunj during summer season of 2010. The fourty four genotypes were evaluated in randomized complete block design with three replications. Observations on days to tasseling and silking, plant height, ear height, ear length, ear diameter, stem borer, wilt and grain yield were taken. Analysis of ANOVA showed that the parameters on days to tasseling and silking, plant height and ear height, ear length, ear diameter was found significant for tested locations. Combined statistical analysis showed that all the genotypes were highly significant for days to 50% tasseling and silking, plant height, ear height, ear length, plant aspect, ear aspect and grain yield but non significant for ear diameter and stem borer. Data on wilt % was found also significant. Result on Anthesis-silking interval (ASI) was significant for genotypes and location but non significant for genotypes x location. The result indicated that Manakamana-4 produced the highest grain yield (5298.61 kg/ha), followed by Upahar (5227.92 kg/ha) and TLBRS SO7F16 (5144.32 kg/ha) respectively.