This depends on which type of grass you're planting and where in the world you happen to be planting it.
The best time to plant fescue is in the fall.
when lows are above 60 degrees
Kentucky Blue Grass
Bermuda Grass in the summer, and Rye in the winter. This website has great information on growing grass in Arizona: http://www.phoenixtropicals.com/grass.html
A mixture of bluegrass & creeping fescue.
spermatophyte
When a plant starts to grow from a seed we say the seed germinates.
an
Bermuda or Kentucky blue
If your planting grass seed its best to plant it in the fall in September. that way the grass seed doesn't ocmpete with any weeds. If your planting sod do it early spring or in fall.
Kentucky Blue Grass
Bermuda Grass in the summer, and Rye in the winter. This website has great information on growing grass in Arizona: http://www.phoenixtropicals.com/grass.html
It is best to plant grass seed in the Detroit area in the fall, in September and October, when the soil is warm and you have the fall rains.
There is no specific date to safely plant grass seed in Detroit, Michigan. The best times to plant is in the spring and the fall.
Early fall and early spring is the best time to plant grass seed in Colorado. This can depend on your specific climate in your area, too.
Because Scotts Turf Builder with Halts prevents the germination of grassy weeds, such as crabgrass, for up to 4 months, it will also prevent the germination of grass seed, including Bermuda grass. It is best to use Scotts Starter Food when seeding new grass seed or sod.
You can, but keep it watered. Early autumn is generally thought to be the best time to plant grass in the Northeastern US. Fall is definitely a better option for you if your lawn has high sun exposure. If you plant grass seed now, there will be less competition from the weeds and crab grass that are abundant in the spring. Also many weed killers can prevent grass seed from germinating.
A mixture of bluegrass & creeping fescue.
earth + fern = tree