Zone 7 Spring Lawn Care Calendar: What to Do and When

Measure soil temperature 2 to 4 inches deep in the morning with a soil thermometer rather than guessing from air temperature. Soil lags the air by days, and every trigger below is a soil reading, not a date.

When soil at 2 inches has held 50 to 55 F for several days running, which in zone 7 usually arrives in early spring, weeks before the lawn looks like it needs anything. A pre-emergent is a chemical barrier in the top layer of soil that stops seedlings as they germinate, so it has to be down and watered in before the weed sprouts. Once you can see crabgrass, the window has closed and you need a post-emergent such as BASF Drive XLR8 Crabgrass Killer Concentrate, 64 oz instead.

Granular products like Scotts Halts Crabgrass and Grassy Weed Preventer, 20.12 lb go down with a spreader on a dry lawn and are watered in. Sprayable Quali-Pro Prodiamine 65 WDG Pre-Emergent Herbicide, 5 lb costs far less per 1,000 square feet if you already own a sprayer. The one rule that catches people out: most pre-emergents also stop grass seed, so skip them anywhere you plan to seed this season. More on the timing is in when to apply pre-emergent, the difference is in pre-emergent vs post-emergent, and the weed itself is covered on the crabgrass page.

Bermuda and zoysia in zone 7 break dormancy as soil passes about 65 F, and they do it unevenly: the sunny strip by the driveway wakes a week or two before the shaded side yard. Full green-up means the whole lawn has turned and is growing, not that patches are showing color.

Feeding dormant or half-awake warm-season grass is the classic zone 7 mistake. The grass cannot use the nitrogen, so it feeds winter weeds instead, and a late freeze on tender new growth pushed by early fertilizer does real damage. Wait for full green-up, then apply 0.5 to 1 pound of nitrogen per 1,000 square feet. With a 32-0-3 product such as Lesco Basic Nutrition 32-0-3 Stabilized Nitrogen Fertilizer, 50 lb, 1 pound of nitrogen is about 3.1 pounds of product per 1,000 square feet. Tall fescue is the opposite case: it is growing hard in spring but should get no more than about 0.5 pounds, because heavy spring nitrogen sets up brown patch in summer.

Height is the cheapest weed control there is. Taller turf shades the soil surface, and crabgrass seed needs light to germinate. Spring nitrogen per application is listed per feeding, not per year.

For tall fescue, spring is the second-best window and a distinct compromise: seedlings get a few cool weeks before summer heat arrives, and you give up pre-emergent protection for the season. If a lawn is too thin to wait, seed early at 6 to 8 pounds per 1,000 square feet for bare soil or 3 to 4 to overseed, using a blend such as Jonathan Green Black Beauty Tall Fescue Blend, 25 lb, and keep the top half inch of soil damp until the first mow. Small bare spots are simpler with Scotts EZ Seed Patch and Repair Sun and Shade, 10 lb.

Warm-season grasses are the opposite: late spring into early summer is their best planting window, once soil holds 65 to 70 F. Seed bermuda at 1 to 2 pounds per 1,000 square feet with Scotts Turf Builder Grass Seed Bermudagrass, 4 lb, or start zoysia from Scotts Turf Builder Zoysia Grass Seed and Mulch, 5 lb or ZoysiaPlug.com Zoysia Plugs, 100 Large Plugs, which spread by runners over a season or two. Details by grass are on tall fescue, bermudagrass and zoysiagrass, and the method is in how to overseed a lawn.