Scotts 4 Step Lawn Program: When to Apply Each Step

Updated September 2026 · Garden Advice Guide

Space the four applications 6 to 8 weeks apart, and anchor the whole year to Step 1, which goes down when soil temperature at 1 to 2 inches deep hits 55°F for three to five straight days. In most of the country that lands between late February in the Deep South and early May in the far North. Get Step 1 right and the other three fall into place: Step 2 in late spring, Step 3 in summer, Step 4 in fall before the ground freezes.

Build the exact dates for your grass type and zone with our free lawn care schedule tool, then use the regional table below to sanity check them.

Updated September 2026

The Scotts 4 Step lawn program is a cool-season calendar sold in one box. That is its strength and its weakness. If you have tall fescue, Kentucky bluegrass, or perennial ryegrass, it is a reasonable default. If you have bermuda, zoysia, or St. Augustine, following the printed schedule will feed your lawn at the wrong end of the year. This guide covers what each step actually does, the trigger for each one, and the four situations where you should skip a step entirely.

This is an independent timing guide. Always read the label on the bag you bought, since formulations and regional packs change from year to year.

What each step in the Scotts 4 Step lawn program does

The names shift slightly between regional packs and between years, but the job of each step has stayed the same.

The one rule that matters more than the calendar. Never apply two steps closer than 6 weeks apart, and never apply more than the label's annual nitrogen total. Doubling up because you missed a window is the fastest way to burn a lawn and push runoff into the storm drain.

When to apply Step 1: the soil temperature trigger

Step 1 is the only step where a missed window cannot be fixed later, because pre-emergent does nothing to crabgrass that has already sprouted.

The trigger is soil temperature, not a date. Crabgrass germinates when soil at 1 to 2 inches deep reaches 55°F and stays there. Push a soil thermometer in mid-morning, in a sunny spot, and read it three days running. Once you get three to five consecutive days at 55°F, apply.

The free plant indicator is forsythia. When forsythia shrubs in your area are in full yellow bloom, soil is at or approaching 55°F. When the yellow flowers start dropping, you are at the back edge of the window and should apply immediately. It tracks soil temperature better than any calendar date because both respond to the same weather.

Water it in. Pre-emergent granules need about half an inch of water within a few days to move the active ingredient into the top layer of soil where seed is germinating. Rain counts. Dry granules sitting on thatch do nothing.

Do not rake or core aerate afterward. The barrier is a thin, continuous layer. Anything that tears it open gives crabgrass a doorway. That includes dethatching, aeration, and heavy digging.

Consider splitting the application. Many people apply half rate at the 55°F trigger and the second half six to eight weeks later. That stretches the barrier through the long crabgrass germination period, which runs into June in the North. Check your bag's label before splitting, since not every product allows it.

Skip Step 1 entirely if you plan to seed this spring

Pre-emergent cannot tell a crabgrass seed from a fescue seed. Both are seeds, and both get stopped. If you put down Step 1 in April and try to seed bare patches in May, nothing comes up and you will blame the seed.

Decide in February whether this is a seeding year or a pre-emergent year. In a seeding year, skip Step 1, mow high to shade out crabgrass, and do your seeding in fall instead. Our guide to overseeding a lawn in fall covers that window in detail.

When to apply Step 2, and the wet-grass rule

Step 2 is a weed and feed. The herbicide is coated onto the fertilizer granule, which means it only works if the granule sticks to a weed leaf long enough to be absorbed.

Apply to wet grass. Early morning dew is ideal. If there is no dew, run the sprinklers lightly first. Granules landing on dry leaves bounce off and do nothing but fertilize the weed.

Do not mow for two days on either side. Mowing before removes the leaf surface the granule needs to land on. Mowing after removes the treated tissue before it has absorbed.

Give it 24 to 48 hours without rain. Rain washes the granules off the leaves before the herbicide moves into the plant.

Watch the thermometer at the top end. Most broadleaf herbicides get risky above about 85°F, where they can injure the grass along with the weeds. In the transition zone and the South, that pushes Step 2 earlier into spring rather than later.

Weeds must be actively growing. A dandelion in full leaf and flower is pulling everything into its roots, which is exactly what carries the herbicide down. A drought-stressed weed in a dormant lawn absorbs almost nothing. Our guide to when to spray dandelions explains why fall applications work even better than spring ones on perennial broadleaf weeds.

Skip Step 2 if you barely have weeds. Blanket-applying herbicide across a whole lawn to kill nine dandelions is the single most wasteful part of the program. Spot spray instead and put down a plain fertilizer, or just wait for Step 3. Our weed control guide covers the spot-treatment approach.

When to apply Step 3, and why northern lawns should think twice

Step 3 lands in summer, roughly 6 to 8 weeks after Step 2. In the version that includes insect control, that timing is genuinely useful, because surface feeders like chinch bugs and sod webworms are active then.

The fertilizer half is where northern gardeners should slow down. Cool-season grasses are under heat stress in July and August. They are not growing much, so they cannot use much nitrogen, and pushing top growth during heat stress raises disease pressure and shallows the root system going into drought. Our month-by-month lawn schedule makes the same point: fall is the primary feeding season for cool-season grass, and summer is not.

How to handle it, by grass type:

• Cool-season lawn in the North: move Step 3 to late June rather than late July, or apply it at the lighter end of the label rate. Save your nitrogen for Step 4.
• Cool-season lawn in the transition zone: apply on schedule but water it in thoroughly, and skip it altogether in a drought year when the lawn has gone dormant.
• Warm-season lawn: this is the one step that fits your grass perfectly. Bermuda and zoysia grow hardest in the hottest weeks, so a midsummer feeding is exactly right.

Never fertilize a dormant lawn. Brown, crunchy grass cannot use nitrogen. It runs off or feeds the weeds. Wait for rain and green-up.

When to apply Step 4, the one step nobody should skip

Step 4 is the fall feeding, and for cool-season grass it is the highest-return application of the entire year.

In September, air temperature drops but soil stays warm. Top growth slows, so the plant stops spending energy on blades and starts building roots and storing carbohydrate. Nitrogen applied in that window turns into root mass and winter reserves instead of into grass you have to mow. That stored energy is what makes a lawn green up two weeks ahead of the neighbors in March without you doing anything in spring.

The window by region:

• North (zones 3 to 5): early September through late October, finishing before the ground freezes.
• Transition zone (zones 6 to 7): mid-September through mid-November.
• South, cool-season fescue lawns (zone 7 to 8): October into early December.
• Warm-season lawns: stop feeding about 6 weeks before your average first frost. A late nitrogen push on bermuda or zoysia produces tender growth that winter kills. Look up your first frost date before you decide.

If you only ever do one step from the box, do this one. Our guide to when to fertilize your lawn covers the full reasoning.

Regional timing windows at a glance

Treat these as starting ranges. Your soil thermometer and your forsythia beat any table.

Notice that the gap between Step 1 and Step 4 shrinks as you go north. In zone 3, four applications spaced 6 to 8 weeks apart barely fit in the growing season, which is another reason northern lawns should lean on Steps 1 and 4 and treat Step 3 as optional.

Worked example: a 5,000 square foot zone 6 fescue lawn

Here is a full season on a tall fescue lawn in zone 6 with an average last frost around April 20 and a first frost around October 20.

Coverage math first. Most Scotts step bags are sold in a 5,000 sq ft size and a 15,000 sq ft size. A lawn measured at 60 ft by 85 ft is 5,100 sq ft, so one small bag per step covers it with almost nothing to spare. Measure the actual turf, not the lot: subtract the house footprint, the driveway, and the beds. People routinely overbuy by a third because they used the lot size.

Spreader setting. Use the setting printed on the bag for your spreader model. Then apply half the rate walking north to south and the other half walking east to west. Two light perpendicular passes give far more even coverage than one heavy pass, and they hide the stripes that show up three weeks later.

What that schedule buys you. Crabgrass stopped before it germinates, broadleaf weeds knocked out in one pass instead of four spot sprays, and a lawn that greens up in March on stored energy instead of on a panic bag of spring nitrogen. Total time on the spreader across the year is under two hours.

What it costs you. No spring seeding. That is the real trade in the 4 Step program, and it is why the seeding-versus-pre-emergent decision belongs in February, before you buy anything.

The mistakes that waste the whole program

Adapting the program to a warm-season lawn

The box is a cool-season plan. Bermuda, zoysia, St. Augustine, centipede, and bahiagrass all run on close to the opposite calendar: dormant and brown all winter, green up in late spring, grow hardest in July and August.

What changes:

• Step 1 still applies at 55°F soil temperature. Crabgrass germinates on the same trigger regardless of what your lawn is. In the Deep South that is often late February.
• Move the heavy feeding to late May through July. Warm-season grass wants nitrogen while it is growing hard, which is the exact window a cool-season lawn should be left alone.
• Stop feeding about 6 weeks before first frost. A fall winterizer on bermuda produces soft growth that gets killed by the first cold snap. This is the single most common warm-season mistake.
• Centipede is a special case. It wants very little nitrogen, and standard program rates will damage it over time. Use a low-rate centipede-specific program instead.

FAQ

How long should I wait between Scotts steps?

Six to eight weeks between applications is the standard spacing, and 6 weeks is the floor. Applying closer together stacks nitrogen faster than the lawn can use it, which risks burning the grass and sending fertilizer into the storm drain. If life got in the way and you are behind schedule, skip the missed step rather than compressing two into a month.

What happens if I miss Step 1?

You lose the crabgrass barrier for the year, and no later application brings it back, because pre-emergent only stops seed as it germinates. Switch to plan B: mow high at 3.5 to 4 inches so crabgrass seed never gets the sunlight it needs, spot treat any crabgrass that appears while it is still small, and put your effort into a thick fall lawn instead.

Can I put down grass seed after applying Step 1?

No, not for 8 to 16 weeks depending on the active ingredient in your bag. Pre-emergent blocks grass seed exactly as effectively as it blocks crabgrass seed. If you need to seed this spring, skip Step 1 entirely, or use a seeding-safe pre-emergent product and read the label carefully before you buy.

Do I have to water in the Scotts 4 Step lawn program?

Step 1, Step 3, and Step 4 all want about half an inch of water within a few days of application to move the granules off the blades and into the soil. Rain counts. Step 2 is the exception: it needs to stay dry on the leaves for 24 to 48 hours so the weed killer can be absorbed, so water that one in only after two days have passed.

Does the 4 Step program work on bermuda or St. Augustine?

The steps themselves work, but the printed timing does not. Warm-season lawns need their heavy feeding in late spring and summer, not in fall, and a late-season winterizer can cause real winter injury. Keep the Step 1 pre-emergent on its 55°F soil trigger, shift the feedings into the summer, and stop fertilizing about 6 weeks before your first frost.

Can I apply Step 2 to a newly seeded lawn?

Not until the new grass has been mowed three or four times, which usually means at least four weeks after germination. Broadleaf herbicides injure seedling grass, which has almost no root system to recover from. Our guide to when to mow new grass covers the timeline, and fertilizing after overseeding explains what a new seeding should get instead.

Is the 4 Step program too much fertilizer for my lawn?

It can be. Four applications across a season is on the high side for a low-maintenance lawn, especially in the North where two feedings (spring pre-emergent and fall winterizer) are usually enough. A soil test tells you what your lawn actually lacks, and it often shows that phosphorus and potassium are already sufficient and only nitrogen is needed. Skipping Step 2 and Step 3 on a lawn with few weeds is a perfectly reasonable version of the program.

What soil temperature do I need for Step 1, and how do I measure it?

55°F at 1 to 2 inches deep, held for three to five consecutive days. Use an inexpensive soil or compost thermometer, push it in mid-morning in a sunny section of lawn, and check the same spot each day. Many local extension offices and turf schools publish live soil temperature maps for their state, which is a good cross check if you do not own a probe.