You need to consider a variety of factors if you are planting grass in New Jersey, but when to plant is surely among the most important. Grass planted at the right time and under the right conditions will thrive, potentially providing a healthy lawn for years to come.
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When you plant grass depends on what type of grass you plan to grow. Grasses for lawns are divided into two basic categories: cool-season grasses and warm-season grasses. Cool-season grasses are better-suited to New Jersey lawns, and the Rutgers University Cooperative Extension's website recommends seed mixtures that include Kentucky bluegrass, fine fescues, perennial ryegrass and tall fescue.
The best time to plant grass in New Jersey is late summer and early fall; this period has conditions ideal for establishment and adequate growth. According to Rutgers, New Jersey residents north of Trenton should plant grass between Aug. 15 and Oct. 5. If you live south of Trenton, you can plant grass between Aug. 20 and Oct. 10.
If necessary, you can reseed your lawn the next spring to help establish your lawn. This secondary establishment period should take place during the first dry, warm period of spring, no matter where in New Jersey you live. Wait until the soil is dry enough to till without forming clods, because excessively wet soil can cause poor growth and germination.