Exactly When to Plant Grass Seed in Spring (2024)

FAQs

Is it worth seeding a lawn in spring? ›

Fall is the best time to introduce new seed into an existing lawn of cool-season grasses. But, depending on your grass type, overseeding in spring can yield good results, too, if it's done early enough in the spring to give seedlings enough time to mature before the onset of the summer heat.

Planting in late spring and early summer gives warm-season grasses the advantage of warm soil and early seasonal rains, which help keep soil moisture available during germination and establishment. Moderate spring weather helps spring-planted grass seed flourish.

Fall is the best time. The autumn season comes with a mix of warm soil and cool air, perfect for planting grass seed and allowing time for new grass roots to develop before winter sets in. It is also a good time to fertilize to build stronger, deeper roots for winter, resulting in a thicker, greener lawn next spring.

Grass that is seeded late can die as a result of the cold harsh conditions, or due to drying out. Freezing and thawing of the soil, coupled with a lack of moisture, leaves the tender roots and crowns susceptible to desiccation. Seeding late into the season still requires the same steps.

After the last frost

Since weather conditions vary across the United States, gardening times will also differ. For instance, Californians can start planting grass in spring during mid-April or mid-May.

Best time to attempt spring grass seeding

The best time to seed in the spring is mid-March through early April. Like fall seeding, the soil must first be prepared. The recommended method is verticutting. A verticut slices grooves in the soil that allows for the necessary seed and soil contact for germination.

Cool-season grasses go dormant and do not grow during hot weather, when the soil temperature goes above 65 degrees F. Since this is common during the peak summer months, planting cool-season grass seed can result in poor seed germination or even seedling death.

Too much grass seed causes undue competition for resources such as light, water and nutrients, and grass seedlings struggle as a result. Too little seed leaves lawns thin or bare.

The best time to water grass seed is in the morning and evening. These are the coolest parts of the day, which allows water to absorb into the ground instead of evaporating.

Do I apply the fertilizer before seeding or after? Apply the fertilizer before seeding. When is the best time to plant a new lawn? Spring and fall are the best times to plant a new lawn.

Can I fertilize and seed at the same time? ›

Applying fertilizer at the same time you seed your lawn is not a recommended idea. Many experts will tell you that doing so you could risk to destroy a large part of your lawn where the soil was heavily fertilized.

Twice daily watering is essential until the new grass is up, then after one more week, reduce to once per day. Adjust this pattern according to season and temperature demands.

Will grass seed grow if I just throw it down? Probably not. Some seeds on the soil's surface will sprout, but the germination rate will diminish, and you will not be left with ideal results.

Do not allow the top ½ inch of the soil to become dry until the grass is 1 inch tall. Once the grass is 1 inch tall, water the grass every other day until grass is established (approximately three weeks). Once the grass is established, revert to watering 1-2 times a week for a total of approximately 1 inch of water.

As a general rule, hardwearing seed mixtures, usually containing rye grass and red fescue, germinate after just four days. Other seeds, particularly bent and meadow grasses, can take up to two weeks to grow.

Most grass seed will start growing in about 10-14 days, but sometimes it can take up to 30 days. When you're planting new grass seed in your yard, it can seem like it's taking forever to start sprouting.

Remove large rocks and debris, fill in low spots, and if your soil is compacted, work it over with a tiller. Your goal is to break the soil down to pea- or marble-sized particles, which will serve as a welcome mat for the grass seed.

Do not put top soil over grass seed, but you can add a thin layer of organic matter to help the seed to germinate. 'Never put topsoil over newly planted grass seed,' says Yamaguchi. 'This won't provide healthy growing conditions – it will actually prevent the seedlings from sprouting by essentially suffocating them.

Use a “mist – lightly water – deeply water” process like this: After seeding and fertilizing, you'll want to keep the top inch of soil moist until the seeds start to germinate (aka sprout). This means misting the area once a day, maybe twice if it's unusually hot out there—but don't let the area get soggy.

Is 90 degrees too hot to plant grass seed? ›

Once temperatures reach 77 degrees, it becomes too hot for root growth, and root growth ceases. When temperatures reach 90 degrees, it becomes too hot for shoot growth and the grasses stop growing and begin to fall dormant, with the surface grass turning a brown hue.

Daytime temperatures around 60 to 75 degrees Fahrenheit typically mean the soil temperature is between 50 and 65 degrees and perfect for seed germination. If the soil temperature is much lower than 50 degrees, however, the seeds will lay dormant and not germinate.

Grass seed on its own is resilient and can survive freezing. However, that does not mean it is a good idea to plant your grass seeds in winter. It is best to put down grass seed at a time when it is mostly likely to germinate and grow into strong, sturdy grass.

Once you finish spreading the seed, use a rake to lightly work it into the soil at a depth of about 1/4 inch. Don't bury the seeds any deeper; grass seed needs adequate light to germinate quickly. After raking, pass over the area with a roller, which helps ensure the good seed-to-soil contact your new seed needs.

New grass should be watered twice a day (or more under dryer conditions) to keep the top two inches of soil moist at all times. Water daily until all of the grass seeds have germinated, then it will be ready to begin a regular watering schedule.

Whether you've seeded bare spots or a whole lawn, hold off on mowing the area until the new grass has reached mowing height. Make sure your mower blade is nice and sharp, and cut your grass only when it's dry. Don't cut it too short and do not remove more than 1/3 of the grass height in a single mowing.

Seed in early spring, late summer or fall (spring plantings are at risk from hot and dry conditions over the summer). Fertilize in early spring (after a mild winter), late spring or early summer (after a cold winter), late summer and fall.

You are probably wondering whether you should fertilize or overseed first in the spring. Either way you choose to proceed is fine; however, you will want to apply starter fertilizer immediately before or after seeding, according to PennState Extension.

Most weed and feed fertilizers contain a herbicide that prevents seed germination, so it is recommended to wait until your new grass is well established and you have mowed it a minimum of 4 times (usually 6 to 8 weeks) before applying a weed and feed fertilizer.

Overseeding can help you get back to the thick, lush, green lawn you've always wanted. By spreading grass seed over your existing lawn, you can thicken up the thin areas, and your lawn will start to look terrific again. (This is different from reseeding, which is when you start over and plant a completely new lawn.)