When to Sow – Early fall is the optimal time to plant grass seed in New York (mid-August to mid-September). Warmer soil temperatures (between 60 and 70 degrees Fahrenheit) and steady precipitation at this time of year promote quicker germination and deeper roots. 
Is April a suitable month for sowing grass seed?
When to sow spring grass seed – If you have your heart set on growing grass in the spring, you should do so in early April. However, depending on where you reside, spring sowing may include challenges. The spring conditions in the Midwest and Northeast (temperatures in the 60s and 70s and consistent precipitation) are ideal for producing cool-season grasses.
Unfortunately, weeds also thrive in these conditions. This implies that your grass will have to compete with undesirable weeds in order to flourish. In addition, if the springtime weather isn’t ideal, such as if the soil is too cold or too saturated with rain, it’s unlikely that you’ll have much luck producing fresh grass.
Also, if you plan to apply pre-emergent weed control to your lawn around this time, be aware that this will prevent grass seed from sprouting. Suppose the April weather is conducive to sowing grass. Should you do it? You could, but there is a potential you will have problems come summer.
Can grass seed be planted in March in New York?
When to Plant – If you want a green lawn before summer, you may plant grass seed in New York between early April and mid-May. As the grass begins to establish itself, even a mild frost will not harm it. Early fall is the optimal time to plant grass seed in New York (mid-August to mid-September).
Warmer soil temperatures (between 60 and 70 degrees Fahrenheit) and steady precipitation at this time of year promote quicker germination and deeper roots. This will aid the grass plants in establishing themselves before winter arrives. You will also have less competition from crabgrass and other summer weeds.
When the earth heats up in mid- to late-spring, grass plants will establish deeper roots, grow thicker, and build up food stores to prepare them for summer stress.
In New York, cool season grasses are the most frequent grasses. Kentucky Bluegrasses, fine fescues, turf type tall fescue, and perennial ryegrasses are some of these kinds. Tall fescue grass is the finest choice for full-sun areas that require minimal upkeep.
