Spring Lawn Care Checklist: What to Do and When

Most spring lawn mistakes come from doing the right thing at the wrong time. Fertilizing before the grass is ready. Skipping pre-emergent until it's too late. Aerating when you should be overseeding.

This checklist covers everything, in the right order, split by grass type. Work through it sequentially and you won't miss a window.

Before You Do Anything: Check Soil Temperature

Every task on this list has a temperature trigger. Before you apply anything, check your soil temperature at 2 to 4 inches depth. The Turf app shows this automatically, or check Greencastonline.com by zip code.

The two numbers that matter most in spring:

50 to 55°F: Crabgrass and other summer annual weeds start germinating. Pre-emergent must be down before this threshold.

65°F: Warm-season grasses start actively growing. First fertilizer application for Bermuda, Zoysia, and St. Augustine.

Everything else flows from these two numbers.

Early Spring Checklist (All Grass Types)

These tasks apply regardless of whether you have cool-season or warm-season grass.

Clean up the lawn. Rake out dead debris, matted grass, and any leaves that didn't get picked up in fall. Dead material blocks sunlight and traps moisture. It's also a breeding ground for fungal disease.

Inspect for winter damage. Walk the lawn and look for bare patches, thinning areas, and any signs of snow mold. Snow mold shows as circular patches of grayish-white matted grass. Rake those areas lightly to improve air circulation and let them dry out.

Service the mower. Sharpen the blade, change the oil, replace the air filter if needed. A dull mower blade tears grass instead of cutting it cleanly. Torn grass tips turn brown and make the lawn more susceptible to disease. Do this before the first mow.

Soil test. If you haven't tested in the past two to three years, send a sample to your county extension office or a private lab. Results take a week or two. Get them back before you apply any fertilizer so you know exactly what your lawn needs and what it doesn't.

Cool-Season Grasses (Tall Fescue, Kentucky Bluegrass, Fine Fescue)

Step 1 — Pre-emergent (soil approaching 50°F)

Apply before soil temperatures hit 50 to 55 degrees. In Zone 5 that's typically late March to early April. In Zone 6 to 7 it's often late February to mid-March.

Use prodiamine or dithiopyr at labeled rates. One application covers 8 to 12 weeks depending on the product and application rate.

Important: if you plan to overseed bare spots this spring, skip the pre-emergent in those areas. Pre-emergent cannot distinguish between crabgrass seed and grass seed. You'll need to choose one or the other.

Step 2 — Light fertilization (soil at 50°F, grass actively growing)

One light application in early spring is acceptable. Keep it at 0.5 pounds of nitrogen per 1,000 square feet. Use a slow-release product. This is not the main fertilization event for cool-season grass — that happens in fall. This is just a light feeding to support spring growth.

Stop all nitrogen fertilization by mid-May. Fertilizing cool-season grasses in late spring and summer increases heat stress and brown patch pressure significantly.

Step 3 — Mowing

Start mowing when the grass reaches about 4 to 4.5 inches if you maintain at 3 inches. Never remove more than one-third of the blade at a single mowing. Mow every 5 to 7 days during active spring growth. Mow at 3 to 3.5 inches.

Step 4 — Broadleaf weed control (as needed)

Spot-treat dandelions, clover, henbit, and other broadleaf weeds with a selective post-emergent containing 2,4-D + dicamba. Apply when temperatures are between 50 and 85 degrees and the grass is actively growing. Do not spray during drought or when grass is stressed.

Step 5 — Overseed bare spots (optional)

If you have bare or thin areas and skipped the pre-emergent in those spots, overseed in early spring with matching seed. Keep the seedbed moist with light, frequent irrigation until germination. Fall is the better window for major overseeding on cool-season grass but spring works for spot repairs.

Warm-Season Grasses (Bermuda, Zoysia, St. Augustine)

Step 1 — Pre-emergent (soil approaching 55°F)

Apply before soil temperatures hit 55 degrees. For Zone 8 and warmer that often means February. For Zone 7 it's late February to mid-March.

Warm-season lawns need pre-emergent before green-up, not after. Bermuda that isn't fully green yet has gaps in the canopy where crabgrass can easily establish. Get the barrier down first.

Step 2 — Wait for full green-up

Do not fertilize until the lawn is fully green and you have mowed it at least twice. Applying nitrogen before full green-up stresses the plant and risks damage from a late frost. Patience here pays off.

Step 3 — First fertilizer application (soil at 65°F, mowed twice)

Apply 0.5 to 0.75 pounds of nitrogen per 1,000 square feet. Use a slow-release product for this first application. The lawn is waking up and doesn't need a heavy push.

Step 4 — Mowing

Start mowing when Bermuda and Zoysia reach about 2 to 2.5 inches. Maintain Bermuda at 1 to 1.5 inches for hybrid varieties, 1.5 to 2.5 inches for common. Maintain Zoysia at 1 to 2 inches. Mow every 5 to 7 days once growth picks up.

Step 5 — Check for spring dead spot (Bermuda only)

As Bermuda breaks dormancy, look for circular sunken patches of brown or tan turf. That's spring dead spot, caused by a fungal pathogen active in fall. Mark affected areas and apply nitrogen monthly through summer to promote recovery. Consider a fall fungicide application if the problem is recurring.

Step 6 — Dethatch and aerate (Bermuda and Zoysia)

Dethatch in late spring after full green-up if thatch exceeds half an inch. Core aerate in late spring or early summer during active growth. Do not dethatch before full green-up.

What Not to Do This Spring

Don't fertilize too early. The grass can't use it and you're just feeding weeds. Wait for soil temperature triggers.

Don't skip the pre-emergent. Once crabgrass is up, your options are limited and expensive. The window is narrow. Miss it and you're dealing with it all summer.

Don't aerate cool-season grass in spring if you can help it. Spring aeration on cool-season grass opens the soil up for weed seed germination. Fall is the correct time. Only aerate in spring if the lawn is severely compacted and needs immediate help.

Don't apply herbicide and overseed at the same time. These two tasks are incompatible. Pick one.

FAQ

When should I start mowing in spring?

When the grass reaches about 50% above your target mowing height. If you maintain at 3 inches, start mowing at 4 to 4.5 inches. Don't mow just because it's a certain date. Mow when the grass tells you to.

Do I need to dethatch every spring?

No. Most lawns don't need annual dethatching. Check thatch thickness by digging a small section. If the thatch layer is less than half an inch, leave it alone. Dethatching when it isn't needed stresses the lawn unnecessarily.

Can I apply pre-emergent and fertilizer at the same time?

Yes, as long as soil temperature triggers are right for both. Many products combine a pre-emergent with a light fertilizer. Just make sure you're not applying significant nitrogen before the grass is ready to use it.

How do I know if my lawn needs lime?

A soil test will tell you. Low pH is common in the eastern US and limits nutrient availability even when fertilizer is applied correctly. If your soil test shows pH below 6.0, apply lime according to the recommendation. Spring or fall are both acceptable times.

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See all seasonal guides → getturf.app/guides/seasonal