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Present research was carried out at Wheat and Barley Research Institute, Tandojam during 2017-18. The experiment was set on two different sowings dates viz., 19th November (Normal) and 19th December (Late) for ten exotic spring wheat lines. The analysis of variance for normal sowing for genotypes, treatments and genotype x interaction revealed highly significant differences at 0.01% probability level for all the attributes. The mean performance displayed that under normal conditions, HTWYT/1 produced the most dwarf plants and maximum chlorophyll content. Maximum spike length, spikelets/spike, biological yield/plant and harvest index were seen in local check (Sindhu) and 1000 grain weight (g) was recorded in HTWYT/06. Whereas more tillers/plant, number of spikelets/spike, grain yield/plant, biological yield/plant and relative water content were noticed in HTWYT/9 at normal sowing date. HTWYT/8 demonstrated more grains/ spike; however, more biological yield/plant and harvest index was measured in HTWYT/7 under timely sowing conditions. In case of heat stress conditions, HTWYT/1 produced the shortest plants, maximum grain yield/plant and chlorophyll content. HTWYT/9 revealed the most number of fertile tillers/plant, biological yield plant-1 and relative water content, HTWYT/3 showed the longest spikes, Sindhu expressed maximum spikelets/spike, HTWYT/4 manifested number of grains per spike, HYWYT/6 showed the most grain yield/plant, 1000-grain weight, HTWYT/2 produced maximum harvest index in high temperature conditions. In case of correlation, almost all traits exhibited positive and highly significant associations with one another. The genotypes (HYWYT/1, HYWYT/6 and HYWYT/9) performed best in both heat stress and non-stress conditions were observed to be heat insusceptible for most of the traits. [ABSTRACT FROM AUTHOR]