When should I fertilize my lawn in Virginia?

For most Virginia lawns, fall. Tall fescue and the other cool-season grasses that cover most yards here should get most of their fertilizer between late summer and early November. Warm-season lawns, bermudagrass and zoysiagrass mostly, are the opposite: feed them in late spring and summer, after they have greened up. Whatever the grass, a soil test every few years tells you what besides nitrogen it actually needs.

The calendar at a glance

Virginia Tech puts the best time to fertilize cool-season grasses in Virginia from mid-August through early November, with the exact timing shifting a little by region.^[1] By contrast, warm-season grasses do best fertilized between April 1 and August 15^[1] in this state.

Cool-season lawns: fall is the main event

Extension sums up the cool-season program with the acronym SON, for September, October and November.^[2][5] Henrico County's Extension office recommends three feedings about four weeks apart, each supplying no more than 0.9 pound of nitrogen per 1,000 square feet for most lawn fertilizer products,^[5] based on research showing tall fescue needs about 2.7 pounds of nitrogen per 1,000 square feet a year.^[5]

Why fall? Fall feeding builds roots, keeps the lawn greener into winter and helps it green up sooner in spring without the soft, disease-prone growth that heavy spring feeding brings.^[5] A thicker lawn going into spring also leaves less room for crabgrass.

You do not have to make three trips. On a well-established cool-season lawn, a single early September application of a controlled-release fertilizer may be enough.^[2] Whatever you choose, one rule has no exceptions: Never apply fertilizer to frozen soil.^[2]

Spring for fescue: less than you think

Many people fertilize in March because the lawn looks hungry. Small amounts of nitrogen in spring can help roots, but aggressive spring feeding raises the risk of summer disease and drought injury.^[1] Excessive spring nitrogen can increase weed and disease pressure^[6] as well. Virginia Tech's cool-season calendar keeps spring feedings modest: 0.25 to 0.5 pound of water-soluble nitrogen per 1,000 square feet every four to eight weeks in the secondary seasons, against up to 0.7 pound every three to four weeks in fall.^[3]

If you want something on the lawn in spring, a crabgrass preventer without fertilizer is often the better buy. See why a lawn fills with crabgrass for the timing.

Warm-season lawns: summer feeding

Start feeding warm-season grasses only after spring green-up is complete.^[4] How much depends on the grass. Bermudagrass and St. Augustinegrass can take up to 4 pounds of nitrogen per 1,000 square feet a year, while zoysiagrass and centipedegrass should get only 1 to 2 pounds.^[4]

Know when to stop. Virginia Tech says to make the last nitrogen application on bermudagrass or St. Augustinegrass no later than one month before your expected first frost.^[2] Heavy late-summer feeding of bermudagrass can leave it more prone to winter injury.^[1]

Adjust for your yard

• Shade. Grass in heavy shade needs only one-half to two-thirds as much nitrogen as grass in full sun, and is best fed after most tree leaves have fallen, usually in October and November.^[1]
• Where you live. Western Virginia's higher elevations can have a growing season three months shorter than southeastern Virginia,^[1] so a Blacksburg lawn's window opens later in spring and closes earlier in fall than one in Virginia Beach.
• Clippings. Returning clippings can supply up to one-third of a lawn's seasonal nitrogen.^[1] If you bag them, the lawn needs a little more.

Choosing and measuring fertilizer

The three numbers on the bag are the percentages of nitrogen, phosphate and potash. Lawn maintenance fertilizers sold now are phosphate-free,^[1] which suits most established lawns. Apply phosphorus and potassium only as your soil test calls for them.^[1][5]

A routine soil test from the Virginia Tech Soil Testing Lab cost $10 per sample for Virginia residents when we checked on October 27, 2026.^[7] Your county Extension office can help with sample boxes and forms.

To find the amount, divide the pounds of nitrogen you want per 1,000 square feet by the nitrogen percentage, then multiply by 100. To apply 1 pound of nitrogen with a 28-0-4 fertilizer, you need about 3.6 pounds of product per 1,000 square feet.^[1] Multiply by your lawn's size in thousands of square feet for the total.

Stop and call a pro if

• Fertilizer has burned stripes or patches into the lawn, or the lawn is yellowing despite regular feeding. A soil test and a closer look at drainage, disease or grubs come first.
• The lawn borders a stream, pond or well and you are unsure how to keep fertilizer out of the water.
• The lawn is large, steep or uneven enough that spreading it evenly is hard to do yourself.
• You want a program that combines feeding with weed control. Before you hire, see what licence a lawn care company needs and what lawn fertilization costs.

Browse more lawn and landscaping answers, compare fertilization and weed control services, or find lawn businesses around Blacksburg. To hand off the fall feedings, describe your lawn once and local businesses quote it.