by 
The Curious Bag
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<h4 class="dechead">On One Hand: Spring temperatures, in the 60s or 70s
Spring weather is ideal for planting grass seed because you can get the seed into the ground when it is beginning to thaw and the last freezes of the winter are behind you. Your grass seeds will have started to germinate before the hot summer temperatures arrive.
On the Other: Fall temperatures, cooler than 60s
With fall temperatures, you don't have to deal with summer weeds that have already died off. The cool temperatures decrease the need for water even though the soil itself is still warm. The fall temperatures also help you dodge the hot temperatures in the summer while you are working on your yard.
Bottom Line
Spring and fall temperatures are identical for planting grass seed. The key is to avoid summer heat, which can kill off your grass, and to avoid the freezes of winter, which can keep the seeds from germinating. Moderate temperates are the key, so choose the season that best suits your gardening and home improvement schedule.
Source:
This Old House: When to Plant Grass Seed
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