Choose cool-season grasses for fall establishment. Each grass species prefers a different temperature, and planting at the wrong time results in failed germination and a bare yard. Warm, spring weather often prompts people to venture outside and seed grass for a lush, summer lawn.But the right seed in cool, fall weather can produce equally good results.If you wait until fall to plant grass seed in cool weather, choose a cool-season grass type for the best rooting and growth results.ecause of cool-weather rains and winds, grass seed broadcasting needs to be followed with a pressing action from a lawn roller. This tool is simply rolled across your seeded area so that the seeds achieve their ideal depth of 1/8 to 1/4 inch into the ground.