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.
Fertilizing in the fall helps plants be hardier when the temperatures drop. We also recommend applying fertilizer in the late fall, toward the end of October or early November. This application will catalyze one last frenzy of root growth and really give your plants some staying power through the cold months.
Best Fall Lawn Fertilizer
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.
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.
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.
You can usually apply most non-liquid granular fertilizers to wet grass, but not saturated ground. If there are ponds or heavy rain, it's best to wait until the ground processes the water before applying any type of fertilizer. If there's light rain, it's okay to spread dry granular fertilizer.
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.
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 ...
To water or not to water? There is some discrepancy on whether or not you should water your lawn right after fertilizing. Our recommendation is to feel free to water in lightly without soaking your lawn, or simply wait until later in the week when you're expecting some rainfall.
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.
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.
Fertilize your lawn in early fall and again 6 to 8 weeks later with Scotts® Turf Builder® WinterGuard® Fall Weed & Feed. Not only will it help build strong, deep grass roots for a thicker, better lawn come spring, but it also provides nutrients to help repair damage from summer heat, drought, and activity.
Apply a nitrogen-rich fertilizer.
If you want your lawn to look better and be healthier, fertilize in the fall.
As it turns out, the answer may vary depending on your lifestyle. But in general, early morning or late evening are both good times to apply fertilizer. If you're not sure when is best for your specific plants, ask an expert at your local garden center.
“Once spring arrives, your lawn will quickly tap into these nutrients for a beautiful burst of green. 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.”
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.
Early morning is the best time of day to fertilize your lawn. Fresh morning dew provides just enough moisture for your grass to absorb the fertilizer.
Rain After Fertilizer -- Granular Applications
Granular fertilizer and insecticide applications need to be watered in. This activates the product. Slow-release granular fertilizer is not easily washed away and doesn't dissolve quickly in water. So rain after fertilizer is actually a good thing.
For warm-season grasses, any temperature below 65-75°F, depending on grass variety, is too cold to apply fertilizer and give it a chance to fortify your lawn before it goes dormant. For cool-season grasses, you'll want to apply winter fertilizer a couple of weeks before temperatures consistently fall below 60°F.
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.
If fast results are desired, lightly water the product in after application; however, watering-in is not required.
The late afternoon or early evening is the best time of day to fertilize your lawn. With that said, you should never fertilize if there is direct hot sunlight on your lawn. This can lead to burning.
At Master Lawn, we typically say to wait 24 hours before watering your lawn after fertilizing. But it is important to make sure that it does receive a good watering session soon after that 24 hour waiting period. Watering helps the fertilizer to activate and to break down and begin feeding nutrients to the lawn.
How Long Should You Water Your Lawn After Fertilizing? The fertilizer and soil should be thoroughly moist, but don't water so much that the water begins to form puddles. About 20 minutes should do the trick.