This study aimed to assess the heat tolerance of twelve bread wheat genotypes under eight different environments. Wheat genotypes were sown in two locations (Tomas, Luxor governorate, representing Upper Egypt and Alfashn in Bani Suef governorate, representing Middle Egypt) at two planting dates 25th November (recommended) and 25th December (late) during two seasons of 2018/2019 and 2019/2020. The experiment was grown in a randomized complete block design with three replications in each environment. The combined analysis of variance showed that number of spikes/m2, number of kernels/spike, 1000-kernel weight and grain yield were significantly affected by locations, and planting dates. Parameters of phenotypic stability indicated that wheat genotypes Misr2 and Giza171 were highly adapted to recommended environments for grain yield (ton/ha) in Luxor and Bani-Suef governorates, respectively. Whereas, Misr2 and Giza168 could be grown under heat stress environments for grain yield (ton/ha) in Luxor and Bani-Suef governorates, respectively. According to GE biplot and ASV, the most desired and stable genotypes were Shandaweel 1, Line#2, Sids 14 for number of spikes/m²; Misr 2, Sids 14 ,Giza 171 for number of kernels/spike; Line#2, Shandaweel1, Misr 2, Giza 168, Giza 171 for 1000-kernel weight and Line#1, Giza168, Sids12 and Misr2 for grain yield (ton/ha).