Wheat responses to temperature stress were investigated at the Agriculture Research Station, Isfahan University of Technology in 2007. The experiment was laid out using a split-split plot arrangement within a randomized complete block design with three replications. Planting dates (March 13, April 9, May 12, June 12 and July 13) were considered as the main plots. The sub-plots consisted of full sunlight and reduced sunlight (75% of full sunlight) and the sub-sub-plots were Ghods and Roshan- Back cross cultivars. Developmental stages, including days from planting to emergence, emergence to jointing, jointing to flowering and flowering to physiological maturity were measured. Days from planting to emergence were reduced as planting was delayed. Days from emergence to jointing were reduced with delay from the first to fourth planting dates, but increased in the fifth planting date. Days from jointing to flowering and flowering to physiological maturity reduced with delay from the first to third planting dates, but increased in the fourth and fifth planting dates. All developmental stages including days from planting to physiological maturity were correlated with mean air temperatures. Except for the days from planting to emergence, other developmental stages were longer in reduced sunlight than full sunlight. Plant developmental stages were similar between cultivars. Plant dry weight at jointing, leaf dry weight, stem dry weight, spike dry weight, number of stems, number of spikes and plant dry weight at anthesis, number of unfertile stems, number of spikes, number of seeds per spike, and 1000-kernel weight, plant dry weight, grain yield and harvest index at maturity were measured. Plant dry weight at jointing, leaf dry weight, stem dry weight, number of stems, number of spikes and spike dry weight at anthesis, number of unfertile stems, number of spikes and plant dry weight at maturity, grain yield and harvest index were reduced with delay from the first to fourth planting dates, but increased in the fifth planting date. Number of seeds per spike and 1000-kernel weight were reduced with delay from the first to the third planting dates, but increased in the fourth and fifth planting dates. Plant dry weight at jointing, leaf dry weight, stem dry weight, number of stems, number of spikes and spike dry weight at anthesis, number of unfertile stems, number of spikes and plant dry weight at maturity, seeds per spike, 1000-kernel weight, grain yield and harvest index were higher in reduced sunlight than full sunlight. Leaf dry weight at anthesis and number of unfertile stems at maturity were higher in Roshan-Backcross than Ghods cultivar. No