Is it too late to put down grass seed? | Jonathan Green (2024)

If you’re thinking it’s too late to put down grass seed, think again. At Jonathan Green we have helped people to grow gorgeous green lawns for over six generations. Sometimes your lawn benefits from seed being put down in springtime and sometimes a late season seeding is better. It takes a little expertise to know the right time to sow. The right grass seed at the right time When choosing your grass seed, think ‘time and type’. There are four different climate zones for planting in the US (according the United States National Arboretum), and one ‘wild card’ zone.

  1. Cool-Humid Very northwest; Upper Midwest; Ohio Valley, Northeast
  2. Cool – Arid Some Northwest & West; Northern Rockies & Plains; Some Southwest
  3. Warm-Humid South; Southeast.
  4. Warm-Arid Some Southwest & Some South.
  5. Transition Zone A changing climate zone stretching from parts of the Northeast to the Southwest and the Upper Midwest to the tips of the Southern States.

Lawn care gets complicated, burdensome and expensive when you try to put down grass seed at the wrong time in the wrong place. It doesn’t matter if you are reseeding your lawn, repairing dead patches or starting your new garden, you must ask – what seed will work in this area? Try the USDA plant hardiness map available here, to identify your climate first. Then, there are two types of seed, warm weather or cool weather grass seed. If you have cooler winters and summers, choose cool weather grass seed, like our Blue Panther, or Black Beauty Fall Magic. If you live with hot summers and warmer winters, opt for the warm weather grasses like Black Beauty Sunny or Black Beauty Sun & Shade. These peak in growth during late spring and summer. Consider the ‘transition zone’ where many lawn lovers are challenged. Cool weather grass seeds fair well here. We often prescribe our customers a clever mixture of both types, depending the State. So if you can’t decide which is the right grass seed for you, then contact us for advice. When to NOT put down grass seed Planting alongside Mother Nature will give your lawn the best start against stresses, such as weather. What grass seed needs is to get going during its natural period of peak growth. This ensures the lawn establishes quickly. Put down cool weather grass seeds at the end of the summer or early autumn when the soil is still warm, and it will be well watered by the oncoming rains. Any later and these seeds become too stressed by summer heat just as they are trying to shoot. Other plants and grasses in the garden will begin to go dormant just as they are coming up, meaning less competition for nutrients. Warm weather grass seed should be sown anytime from early spring to mid-summer, presuming the temperature is over 65°F each day. These seeds need the warmth of summer and infrequent rains to set down strong roots. Both warm and cool weather seed can germinate if it is sown in the ‘wrong climate’. Be certain you plant for type and not for time here. The time to put down warm weather grass seed in a cool climate is in the spring. Plant cool weather grasses in a warm climate in the early fall. Depending on your climate, it’s never too late to put down grass seed, and as experienced growers ourselves we know there are myriad reasons to sow outside the guides. So check-in with Jonathan Green online or locate your nearest independent retail store before you buy for a seeding that takes root.

Is it too late to put down grass seed? | Jonathan Green (2024)

FAQs

Is it too late to put down grass seed? | Jonathan Green? ›

Depending on the type of seed, it is definitely not too late to plant grass seed in October. Cool season grass seed varieties like Jonathan Green Black Beauty grass seed do well with planting in October. The most important thing is to lay the seeds down at least 45 days before the first threat of frost.

How late is too late to put down grass seed? ›

In colder parts of the U.S. (Zones 4-5), the ideal fall grass-seeding window falls approximately between Aug. 15 and Sept. 15. In Zone 6, the back end is two weeks later, and in Zone 7, it's September into mid-October.

Is it okay to put down grass seed now? ›

Grass seed can be planted year-round, but fall is optimal for cool season grass and spring for warm season varieties. Winter planting is discouraged for both due to the risk of seed loss and frost damage. Warm season grass can be seeded in summer, though it requires significant irrigation.

How to check if grass seed is still good? ›

If you have old grass seed and you need to re-seed an area and you're unsure if your seed is viable, here are a few tests to tell if it is still good: Do the float test: Put a small handful of grass seeds in a glass or bowl of water and see how many float. If more than 80% float, then most likely your seed is good.

Will old grass seed still germinate? ›

If stored in a cool, dry place, grass seed can last for two to three years, but you may not get the same results as you would when planting fresh seed. As the seed ages, the percentage of seeds that will be able to germinate diminishes, forcing you to use more seed than normal to get adequate coverage.

Can I plant grass seed in June? ›

4) Late spring (May/June) – late July/early August

You'll be constantly battling crabgrass and weeds. If you're overseeding, keep the following in mind: Always aerate before you overseed. The seed germinates in the plugged holes which presents a cool, wet, soft, and favorable growing environment.

What temperature kills grass seed? ›

If you're wondering how cold is too cold for grass seed germination use our rule of thumb and check the weather reports. If the daytime temperature is below 60°F then soil temperature is below 50°F, making it too cold; if there is frost or still a danger of frost, then it's too cold.

Can I just throw grass seed on bare spots? ›

Can I Just Throw Grass Seed on Bare Spots? Throwing grass seed onto bare spots will result in little-to-no germination and will not help to repair lawn spots. If you want to fix patches on grass, you need to properly prepare the bare spots before laying down the seed.

Should you water right after putting grass seed down? ›

Simply insert a long screw driver into the ground. If it pushes down 6 to 8 inches without much resistance, you have the proper water saturation. Water new grass seed for 5 to 10 minutes immediately after planting to gently moisten the first several inches of soil.

What should grass seed look like after 2 weeks? ›

If the seed's sprout is pushing up through the soil, it has successfully germinated. If there are no sprouts after two weeks, check the seeds. If the seeds still look the same as when they were initially planted or are covered in mold or a fuzzy texture, something has gone wrong, and they might not germinate properly.

What does a bad grass seed look like? ›

Look closely at the grass seed.

If it's discolored or has fungi on it, it is no longer usable and you should throw the seed away.

How long does it take grass seed to show signs of growth? ›

Whether you're repairing bare spots, overseeding an existing lawn or starting from scratch, you can generally expect grass seedlings to emerge within seven to 21 days when grown under proper conditions. It may take another three to four weeks of growth before grass is long enough to mow.

Can you overdo grass seed? ›

As you plan your seed spreading strategy, however, it is important to note that using too much grass seed does not create a lusher lawn. In fact, your grass actually struggles and may fail completely with excessive grass seeds across the topsoil.

What happens if you plant grass seed too late? ›

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.

Does grass seed go on top of soil or under? ›

Will grass seed germinate on top of the soil? Yes; in fact, germination will suffer if too much soil is placed on top of the seeds. The experts at Jonathan Green recommend placing a thin layer of mulch or topsoil over them to help keep them moist and warm and promote growth.

Will grass seed germinate on hard soil? ›

Surface layer crusting: High winds and dry conditions can cause the surface layer of soil to be hard and cracked. The shallow crust lacks the moisture needed for turf grass seeds to germinate. It should be broken up before planting, which is usually easy to accomplish with a hoe or rake.

What is the latest you can plant grass seed? ›

As a general rule, plant cool-season grass seed at least 45 days before the estimated date of your first fall frost, before soil and air temperatures drop to less favorable levels. Your grasses will enjoy a full fall season, plus a second cool growing season come spring.

Can I put down grass seed in November? ›

Early November to mid-December is usually the best time, but it will vary each year depending on weather conditions. You must be quite sure that the seed will not germinate in the current year and it stays inert until the following spring.

How long does it take for grass seed to germinate in October? ›

It can take from two to four weeks for grasses to grow in October, especially if it is a warm-season grass. Cool-season grasses can still germinate and take root in the cooler temperatures of late fall, though you might not see their full potential until spring.

How long can grass seed be dry before it dies? ›

This is fortunate because it means grass seeds can sit dormant in a package on a store shelf for two to three years if they're not exposed to adequate moisture. It also means you can store excess seed in your garage or basem*nt after planting, in case you need to overseed thin or bare spots.

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