Apply fall lawn fertilizer 2 to 3 weeks before the ground freezes. To find an exact date, look for the first frost date in your area. That date is typically a good time to fertilize since the ground hasn't frozen yet. More generally, mid-October is a good time to apply lawn fertilizer.
When To Fertilizer Your Lawn in the Fall. The best time to apply your last fertilizer application is between August 15 and October 1. Ideally, your last lawn feeding should take place six to eight weeks before the average first frost in your area.
Fall Fertilizer Timing
For the majority of cool-season lawn owners, apply fertilizer anywhere from September through early November. The further north you garden, the sooner you'll feed your lawn. Fine-tune the timing for your locale by talking with your local extension service or garden center.
Make the last fertilizer application before July 1.
New growth also needs time to "harden off" before winter. Tender new growth is at risk of cold injury if it is forced late in the season, when plants and trees should be shutting down for winter.
While this fall lawn fertilizer dose is important, an application at the end of October or early November is essential. At that time, apply a fertilizer with a formula of 13-25-12. The push of phosphorus will stimulate root growth through November and even into early December.
The November fertilizer application is the second most important time for cultivating a cool season bluegrass or tall fescue lawn, with September being the most important application. The November application helps the lawn flourish in several ways.
Apply fall lawn fertilizer once between August and November, right before winter hits, 6 to 8 weeks after the summer feeding.
The right time to apply fertilizer is when the grass is growing more roots than blades. In the Northeast and Northwest, that's usually in the fall. In the South and Southwest, it's in the late spring. So in cooler climes, don't even think about it until Labor Day.
Generally speaking, you should fertilize your lawn at least twice a year to ensure good overall health and keep your grass looking its greenest. But if you fertilize at the wrong time or over-treat your lawn, you could encourage weed growth, or possibly burn the grass.
While the best method for determining exactly how much fertilizer is needed is a soil analysis conducted by a laboratory, most cool-season grasses require 2 to 4 pounds of nitrogen per 1,000 square feet each year, and a majority of this nitrogen should be applied in two fall applications; one in September and the other ...
Don't apply winterizer too late—Generally, winter fertilizer should be applied in November or earlier, depending on your climate. Try to avoid applying in early December, as the nutrients within the formula may not take hold in time to protect the grass from the harsh conditions.
This means the temperature can't be below freezing, so the task is typically handled sometime in early November in most places in the north. If you live in a warmer area, however, December can be a great time to fertilize your lawn.
Ideally, you'll want to mow and rake before fertilizing, so that excess lawn waste is removed and the fertilizer will have an easier time reaching the soil. Aerating your soil before fertilizing can also help; the best times to aerate are when your grass is actively growing, such as in spring or early fall.
A complete fertilizer with a high ratio of both nitrogen and potassium is essential for enhanced rooting, cold hardiness, disease resistance, and wear tolerance. An ideal fall fertilizer blend has a nitrogen to phosphorus to potassium (N:P:K) ratio of 24-4-12 with isobutylidene diurea (IBDU).
Don't fertilize when it's winter or early spring
The ideal temperature to fertilize your lawn is 50-70 degrees Fahrenheit. Any lower than this, your lawn will struggle to maintain nutrients.
We recommend waiting 24 hours after fertilizing to water your lawn, which will give the fertilizer time to settle. After the 24 hours are up, it's important to give it a good soak—not just a quick spritz with your hose—to activate the fertilizer and help the critical nutrients absorb into the soil.
You should fertilize your lawn a day or so after a light rain or using a sprinkler. This prevents the application from being washed away. The moisture gets your soil damp and ready to receive nutrients. Do not apply fertilizer before or after heavy rains.
To avoid over-fertilizing, applying a fertilizer every two weeks is not recommended. Fertilizing as often as every two weeks will likely lead to problems such as lawn burn, excessive grass growth, as well as polluted water that can lead to toxic algae growth.
Winterizer fertilizer also contains more potassium than regular fertilizer. The potassium is used to boost the grass's tolerance to freezing temperatures and enhance the root systems”. Winterizer fertilizer also feeds the grass throughout the winter. It even helps keep your grass healthy.
Rain After Fertilizer -- Granular Applications
If you have a lawn care professional apply granular fertilizer or granular insecticide to your lawn, there's no need to panic if it starts raining afterward. Granular fertilizer and insecticide applications need to be watered in. This activates the product.
The answer not very cut and dry, but here is the bottom line: The vast majority of the time, rain after a fertilizer application is not a problem at all. In fact, it is usually a good thing.
Ideal Time to Fertilize
Applying fertilizer (and water) in the afternoon will cause the moisture in the soil that is preventing the lawn from burning to evaporate as the sun beats down on the lawn. It's also important for grass to dry out slightly before the nighttime temperatures.
Nitrogen, phosphorus, and potassium take time to absorb into your soil. Doing anything too drastic on your lawn, such as cutting your grass, will disrupt this process. We always suggest to our clients that they wait 24 to 48 hours before mowing their lawn after fertilization.
It really depends on where you are and what kind of grass you have. Late fall may be better than winter for colder regions. The absolute best time to fertilize your lawn is just before the expected frost date. The goal is the same when you feed grass in late fall or winter as it is with dormant plants.
In fact, a lawn fed twice in the fall will stay green longer into winter and be the first to green up in the spring.” When it comes to what form of fertilizer to use, it all comes back to your objective. “Something like a sulfur-coated type product is good to use earlier in the fall,” Miltner says.