Finding Your Zone
The USDA Plant Hardiness Zone Map divides the U.S. into 13 zones based on average minimum winter temperatures. Each zone is split into "a" and "b" subzones, representing the colder and warmer halves respectively. Your zone determines which grasses grow well at your location and when to perform each lawn care task.
You can find your zone at the USDA Plant Hardiness Zone Map website, or enter your address into the Perfect Lawn Advisor for automatic zone detection plus a personalized care plan.
Zones 3 and 4: The Extreme North
Zones 3 and 4 cover Alaska, parts of Northern Minnesota, North Dakota, and high-elevation areas across the Mountain West. Winter minimums reach minus 30 to minus 40 degrees F. Growing seasons can be as short as 110 days.
Dominant grasses: Fine Fescue blends, cold-hardy Kentucky Bluegrass varieties, Timothy in some areas.
Year-round schedule:
Late April to Early May: Rake and de-thatch winter debris. Do not fertilize until grass actively grows, typically mid-May.
Mid-May: First fertilizer application at 50 percent normal rate. Soil is still cold and roots cannot fully utilize nutrients.
Early June: Overseed any bare patches. Reseeding survives 80 percent better in June than fall in Zone 3.
July through August: Mow at 3 inches. Do not scalp. Heat stress is minimal but drought stress from cool northern winds can be severe.
Late August: Second fertilizer application at full rate. This is your overseeding window if you did not seed in June.
Early September: Final mow at 2.5 inches to reduce snow mold. Leave no clippings that will mat.
Winter: Apply preventive fungicide before first permanent snowfall to prevent pink snow mold. This step saves dozens of hours of spring repair work.
Zone 5: The Northern Tier
Zone 5 covers much of the upper Midwest, Great Lakes, New England interior, and mid-elevation Mountain West. Growing seasons are 140 to 160 days. Winter minimums reach minus 10 to minus 20 degrees F.
Dominant grasses: Kentucky Bluegrass, Fine Fescue, Perennial Ryegrass blends.
Calendar:
Late April: First fertilizer application when soil hits 50 degrees F. Pre-emergent for crabgrass goes down when forsythia is in full bloom.
Mid-May: Mow weekly. Target height 3 to 3.5 inches. Never cut more than one-third of the blade at once.
June through July: Water 1 inch per week if no rain. Grass goes semi-dormant above 85 degrees F. Do not panic about browning.
Early September: Aerate compacted areas. Overseed thin spots. This is the highest-ROI lawn task of the year.
Late September: Third fertilizer application.
Mid to Late October: Winterizer application. Final mow at 2.5 inches.
Zone 6: The Heartland
Zone 6 covers most of the Mid-Atlantic, Ohio Valley, lower Great Lakes, and large portions of the Midwest. Growing seasons are 160 to 190 days. This zone has the most variety in lawn practices because it supports the widest range of cool-season grasses.
Dominant grasses: Kentucky Bluegrass, Tall Fescue, Perennial Ryegrass. Fine Fescue in shaded areas.
Calendar:
Mid-March: Soil testing. Correct pH if below 6.0.
Early April: First fertilizer plus pre-emergent when soil hits 55 degrees F.
Mid-May: Second application (optional, lighter rate).
June through August: Deep watering 1 to 1.5 inches per week. Mow at 3 inches. Fungal disease pressure is highest in this zone.
Early September: Aerate and overseed. This is the most important fall task.
Late September: Third fertilizer application.
Mid to Late October: Winterizer. Final mow.
Zone 7: The Transition Zone
Zone 7 is the most challenging U.S. lawn zone because it supports both cool-season and warm-season grasses, but neither dominates cleanly. Homeowners must choose a strategy. Includes Mid-Atlantic coast, Tennessee, most of North Carolina, and parts of the Mountain West.
Dominant grasses: Tall Fescue dominant. Bermudagrass in full sun. Zoysiagrass as a premium option. Kentucky Bluegrass struggles here.
Calendar (for Tall Fescue):
Mid-March: First fertilizer plus pre-emergent.
Mid-May: Second application.
June through August: Tall Fescue goes dormant in summer heat. Accept brown, do not over-water. This is the hardest month in Zone 7.
Late August to Early September: Overseed aggressively. Tall Fescue thins in summer and needs annual reseeding to stay dense.
Late September: Fertilizer.
Late October: Winterizer.
Calendar (for Bermudagrass):
Early April: Wait for full green-up before any fertilizer.
Late April: First application after full green-up.
June: Second application. Peak Bermuda growth.
August: Third application. Final growth push.
October: Final application. No winterizer.
Zones 8 and 9: The Deep South
Zones 8 and 9 cover the Southeast, Gulf Coast, and Pacific Southwest. Growing seasons are 230 to 300 days. Winter dormancy is brief (Zone 8) or partial (Zone 9).
Dominant grasses: Bermudagrass, St. Augustine, Zoysiagrass, Centipedegrass, Bahiagrass.
Calendar (Bermudagrass):
February to Early March: Apply pre-emergent. Crabgrass germinates early.
Late March: Full green-up. First fertilizer.
May through August: Mow every 5 to 7 days at 1.5 inches for standard Bermuda, 0.75 inches for hybrid varieties.
June: Second fertilizer.
August: Third fertilizer. This is the final application.
October: Overseed with Perennial Ryegrass if you want a green winter lawn (optional aesthetic choice).
November: Bermuda goes dormant. Do not fertilize.
Zones 10 and 11: The Sub-Tropical
Zones 10 and 11 cover South Florida, South Texas, Southern California, and Hawaii. Grasses grow year-round with no dormancy.
Dominant grasses: St. Augustine, Seashore Paspalum, Zoysiagrass, Bermudagrass.
Calendar:
No distinct season structure. Apply fertilizer every 8 to 10 weeks year-round at reduced rates. Irrigation is constant. Disease and pest pressure are the primary management challenges, not cold dormancy.
Your Exact Plan
Generic zone schedules are a starting point, not a finished plan. Your exact timing depends on your microclimate, soil, and current weather. Get your address-specific plan using the Perfect Lawn Advisor.