Growing Grass Seeds: How Long Does It Take?

Growing Grass Seeds: How Long Does It Take?
Ever wonder how long it takes for grass seeds to grow? Perhaps you want to have grass on your lawn. Here's the answer.

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The length of time it takes a grass seed to grow is determined by a variety of factors. From the seeds you choose to sow to the soil conditions and weather, everything is important.

This article will explain how long it takes for grass seeds to grow. We will provide expert guidance on the various elements involved, as well as how you may assist your grass seed to grow better, quicker, and stronger.

How Long Does It Take For Grass Seed To Grow?

It takes an average of 8 days for grass seed to germinate after it is disseminated. The seedling will then go through a period of development in order to establish roots and form the recognizable top growth or leaves.

Depending on the kind of grass and other environmental circumstances, top growth will grow at a rate of roughly 2-3 cm per week.

Throughout this essay, we will investigate how long it takes grass seed to grow dependent on the grass species, the type of grass, and the surrounding conditions, all of which have a direct impact on its ability to grow at an optimal rate.

How Long Does It Take Grass Seed To Grow

Grass Seed Germination Rate

The rate at which grass seed germinates is determined by several factors, including grass variety, time of year and meteorological conditions, soil temperature, and moisture. Grass will grow in 8 days on average under ideal conditions.

Some grass kinds germinate in as little as 5 days, while others take up to 22 days. Some grasses can germinate in 2-4 days under ideal conditions. However, in a grass setting, 5 days is considered quick germination.

Grass Type

The type of grass seed you choose for your lawn is the first aspect in deciding how rapidly it will grow. Different grass seed kinds germinate and grow at different rates.

Grass Type

If a grass species are sown at the appropriate time of year and growing circumstances are favorable, Annual Ryegrass can sprout in 5 days, whereas Bentgrass can take up to 3 weeks. The table below summarizes popular grass kinds and their germination rates.

Grass Seed Germination Rate In Days

Depending on the cultivar, it takes between 5 and 30 days for grass seed to germinate under ideal conditions.

  • Bermudagrass germinates in 5 to 10 days
  • Perennial Ryegrass germinates in 5 to 7 days
  • Annual Ryegrass germinates in 5 to 10 days
  • Kentucky Bluegrass germinates in 10 to 21 days
  • Red Fescue germinates in 12 to 22 days
  • Zoysia Grass germinates in 14 to 21 days
  • Bentgrass germinates in 14 days

Of course, grass variety is only one of several elements that influence germination and growth rate. So, let’s go through some of the other external or environmental factors that affect seed germination and grass growth rates.

Grass Germination Temperature Chart

Grass may germinate in temperatures as low as 50 degrees Fahrenheit, but this is not ideal. Temperatures of 59 degrees Fahrenheit or higher are ideal for cool-season grass and temperatures of 68 degrees Fahrenheit or higher for warm-season grass.

Turfgrass SpeciesOptimum Air Temp F.
Creeping bentgrass59-86
Annual bluegrass68-86
Kentucky bluegrass59-86
Rough bluegrass68-86
Tall fescue68-86
Red fescue59-77
Sheep fescue59-77
Chewings fescue69-77
Perennial ryegrass68-86

Soil Temperature

The temperature of the soil and the air change with the seasons. In the spring, soil temperature lags behind air temperature because it takes longer to heat through.

However, when it comes to grass seed germination, air and soil temperatures are regarded as equal because grass seeds sit on top of the soil. As a result, the soil surface temperature is extremely near to the ambient air temperature.

How To Speed Up Grass Seed Germination

There are several actions you may take to speed up the germination process and increase the rate at which seeds germinate.

Prepare Your Soil

All seeds like to germinate in loose, aerated soil that is well-structured with organic matter and can retain moisture. Keep this in mind as you prepare your planting area with high-quality dirt. Level it off, but avoid compacting the earth by walking on it.

The looser the soil, the better it will keep moisture and allow the fragile seed root to penetrate and establish itself.

Grass Type

Planting grass on hard or dry soil will result in the seeds waiting for a rainstorm. If this is followed by a dry, hot time, your delicate seeds are likely to dry out and perish.

Watering New Grass Seed

Freshly sprouted grass seeds should be planted in damp soil. To minimize disturbing or displacing the seed during germination, I recommend watering new grass seeds with an oscillating sprinkler. During dry, hot weather, I recommend watering twice a day for three weeks. If there is rain, treat it as a watering that can be left to nature, but continue with the rest of the watering plan and keep the soil moist.

Reduce watering to once per day after germination for another week or two until the grass roots take hold.

Sow Seeds At The Optimum Temperature

Following my recommendations on the best temperature for germination can also assist accelerate germination. If you scatter sees and then leave them on chilly soil, they will remain inactive until the proper air and soil temperatures are reached.

Pre Germinating Seeds

Pre-germinating seeds is an excellent approach to get the germination process started. However, grass seeds cannot be treated in the same way that plant or vegetable seeds are. By soaking seeds in water for 24 hours, you can jumpstart the process and totally soak the seed husk, making the seed active.

Grass seeds, on the other hand, must be dispersed, and this is best done when the seed husk is dry. My advise is to prioritize soil preparation and watering over all else, and the seeds will germinate in no time.

How Fast Does Grass Grow

After the germination stage, grass growth occurs in two stages: root development and top growth or foliage. Our primary interest will be in top growth.

During the most active stage of growth, grass grows 2 cm (0.88 inch) every week on average. However, this is only an average; in some cases, it can increase significantly quicker. So, let’s take a closer look at what influences grass growth rate.

Grass Type Influences Growth Rate

The rate of growth throughout the year is greatly influenced by the species of grass as well as the kind of grass (warm season versus cold season). The graph below compares the rates of growth of warm-season and cool-season grass.

Grass Type Influences Growth Rate

Cool-Season Grass

Cool-season grasses thrive in cooler weather, typically in the fall and spring. These grasses thrive in milder climates, such as the northern United States. Among the cool-season grasses are:

  • Kentucky bluegrass
  • Perennial ryegrass
  • Tall fescue
  • Bentgrass
  • Red Fescue

Warm-Season Grass

Warm-season grasses sprout and grow best during the warmer months of the year, such as late spring and early summer. They also thrive in warm climates, such as the southern United States. Warm-season grasses include the following:

Choosing the correct grass for your area will help your lawn get off to a good start, allowing it to develop and thrive.

Conditions Affecting Grass Growth Rate

Aside from grass species, environmental circumstances have a considerable impact on how fast grass grows. Light, temperature, moisture, and soil condition all play a role in how effectively a grass species may attain its full potential.

Hours Of Sunlight

Most grass species require at least 4-6 hours of sunlight every day. Without it, the grass’s growth would be restricted, and the lawn will be vulnerable to disease and pests. As a result, it stands to reason that a grass that receives 12 hours of direct sunlight per day will develop quicker than a lawn that receives 6 hours of light per day.

Hours Of Sunlight


The temperature of the air and the soil will determine how quickly grass grows. As previously said, there is no single guideline for the ideal temperature for grass, as it varies based on the grass variety (warm or cool-season grass)


We will all be familiar with a garden that has suffered from a lack of rain, including plants, trees, fruits, and, of course, grass. Lawns thrive in periods of excessive rainfall. They prefer a thorough soak for the first two inches of soil, followed by a clear sky to absorb as much sunshine as possible. As a result, regular rain might lead to gloomy sky and insufficient sunlight, inhibiting grass growth.


Soil Structure

Most grasses thrive on rich, loamy, well-draining soil. This will aid in moisture retention while also retaining a sufficient amount of nutrients for root and top growth development.

If the soil is excessively sandy, it will become depleted of nutrients and will dry up too quickly to sustain optimal growth.

Soil PH

Most grasses thrive in soil pH ranges of 6.0-7.0. If the pH of the soil is outside of this range, the available nutrients in the soil may not be absorbed by the plant’s roots. This can result in chloris or mineral deficiencies.

Soil Structure

To find the optimal pH for your lawn, use a pH soil test kit and amend the soil with sulfur or lime.

Soil Nutrients

To allow grass to grow quickly, three nutrients are required. Phosphorus (P), Nitrogen (N), and Potassium (K) (K). Grass will suffer if these nutrients are not balanced properly. For healthy, fast-growing grasses, use an N-P-K ratio of 15-0-5, 16-4-8, or something similar. Nitrogen levels are high for aggressive foliage growth, and potassium levels are moderate for vigorous root development.

Fastest Growing Grass Type

If you live in a warm climate, such as the United States, Bermuda grass is the quickest growing grass variety for lawns. It germinates in 5-10 days and grows quite quickly in warm circumstances.

It is also a drought-tolerant grass that can withstand up to three months of dry weather. Overall, it is likely the quickest growing grass for lawn over a full growing season because it is resistant to most environmental difficulties and flourishes.

How Fast Does Grass Grow On Average

Let’s do the arithmetic to figure out the average growth rate from seed to 2″ tall blade of grass.

  • A germination rate of between 5-22 days
  • A growth rate of 1-3 cm per week

So, based on our sample of grass varieties listed at the start of this article, we can simulate an average growth rate from seed germination to a 2′′ tall blade of grass.

So, with an average of 12 days of germination and 2 cm (0,8 inch) of development per week, we may estimate that it will take 31 days to grow 2 inches (4.8cm) from seed.

However, under ideal conditions, the story is rather different. In optimal conditions, grass seeds germinate in 2-4 days and grow at a rate of 3cm (1,2 inch) every week. So, from seed to 2′′ tall, grass may be grown in about 12 days.

Best Time To Plant Grass Seeds

Although you can disperse seeds at any time during the growing season, aligning your planting with the natural cycle of growth will yield the best results. Different types of grass grow better at different times of the year, so choose the one that is appropriate for your climate and planting season.

Best Time To Plant Grass Seeds

Cool-season grasses and warm-season grasses exist.

Cool Season Grass Seed

The optimal time to plant cool-season grass seeds is in the fall. This is due to the fact that the soil is still warm from the summer, and the daytime temperatures are moderate but not excessively hot. Cool evenings keep the soil from being overheated during the day. This temperature balance produces perfect circumstances for cool-season grass seed to germinate.

When you sow grass seed, the soil temperature should be between 50°F and 65°F. Plant any cool-season seed at least 45 days before the first frost in your growing zone to give the grass time to develop before the frost. Because of the fall precipitation, you will need to water less frequently, and the seed will be less likely to dry up.

Although spring is a wonderful time to plant cool-season grass seed, soil temperatures may not be warm enough for grass seed to sprout. You must ensure that the soil temperature and air temperature are both optimal for success.

Weeds might gain an advantage over young grass in a wet spring. Warm temperatures that arrive too rapidly may stress growing grass, causing degeneration and failure.

Warm Season Grass Seed

Warm-season grass seed germinates when daytime temperatures reach around 80°F and soil temperatures reach 65°F to 70°F. Warm-season grass planting dates are determined by your growing zone.

Plant warm-season grass seeds until after all danger of frost has passed, otherwise your little grass seedlings will suffer from freeze burn and perish. This sort of seed will decay if the overall soil temperature is too cool or too damp.

Warm-season grass should be seeded at least 90 days before your growth zone’s first frost date. This variety of grass will go dormant when temperatures fall into the fifties, so give the seedlings plenty of time to establish themselves before the cool season arrives.

The seedlings will germinate and thrive before the fall weather arrives.

To provide some green in the winter, it is possible to overseed warm-season turf with cool-season grass. This should be done in early October to lengthen your lawn’s seasonal life.

New Lawn Care

Once your new grass has sprouted and developed, it will require frequent care and upkeep. There are a few simple steps you can take to improve your chances of having a green and healthy lawn.

New Lawn Care

Regular Watering

The major cause of new-lawn failure is insufficient or excessive watering. Plan ahead of time so that you can properly water your new lawn. Keep the soil moist while your grass seeds germinate, but after the seedlings reach 2 inches in height, you can lessen the frequency of watering.

Regular Watering

Avoid Foot Traffic

For the first three weeks of growth, avoid playing on or walking on fresh lawns.

Do Not Mow Too Soon

Wait until your lawn is 3 to 4 inches tall before mowing it. When you initially mow your new grass, only cut it slightly to make it look clean, taking care not to rip out the vulnerable seedlings.

When you mow the lawn again, you can cut it to the maximum height recommended for your grass type. Never take more than 30% of its height out at once.

Fertilizing New Lawn

For the first six weeks of growth, avoid fertilizing your new grass. You may not need to apply any if your soil is in good shape. If you are doubtful, wait until fall to apply fertilizer.

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