Spring Lawn Care Schedule: The Month-by-Month Plan That Actually Works

Frequently Asked Questions

When should I do the first spring mow?

Mow for the first time when cool-season grass reaches 3-4 inches (usually mid-to-late April in the north) or when warm-season grass shows fresh green at the base (late April to early May in the south). Set the mower to its highest setting for the first cut — never remove more than 1/3 of the blade length. Scalping a dormant lawn stresses it and invites weeds.

Should I dethatch my lawn every spring?

No. Dethatching (removing the layer of dead grass between the soil and living blades) is only needed if the thatch is over 1/2 inch thick. Most healthy lawns produce less than that naturally. Dethatch in early spring before the grass is actively growing. Use a thatching rake for small areas ($20-$40) or rent a power dethatcher for larger yards ($75-$125/day).

When is the right time to apply pre-emergent herbicide?

Apply pre-emergent when soil temperature reaches a sustained 55°F for 3-5 days — this is when crabgrass seeds start to germinate. In most US regions that's early-to-mid March in the south and late March to mid-April in the north. A soil thermometer ($10-$15) is more accurate than calendar dates. Never apply pre-emergent if you plan to overseed in the next 60 days — it prevents new grass seed from germinating too.

Should I overseed in spring or fall?

Fall is the ideal time for cool-season grass (fescue, bluegrass, ryegrass) because the soil is warm, weed competition is low, and cool nights prevent heat stress. Spring overseeding works but fights weed pressure and summer heat — stick to small bare-spot repairs in spring rather than a full overseed. Warm-season grasses (Bermuda, zoysia, St. Augustine) should be overseeded in late spring when soil is consistently over 65°F.

How much does spring lawn care cost?

A typical DIY spring program costs $50-$150 for a standard 5,000 sq ft lawn: fertilizer ($30-$60), pre-emergent ($20-$40), grass seed for bare spots ($15-$30), and optional soil amendment ($15-$40). A professional lawn service runs $300-$800 for the full 3-application spring program. Aeration services add $75-$150. DIY is strongly recommended — the knowledge is simple and the cost savings compound year after year.

What's the difference between warm-season and cool-season grass?

Cool-season grass (Kentucky bluegrass, tall fescue, perennial ryegrass) grows most vigorously when temperatures are 60-75°F — that's spring and fall in the northern US. It goes dormant in summer heat. Warm-season grass (Bermuda, zoysia, St. Augustine, centipede) grows when temps are 75-90°F — summer in the south. It goes brown/dormant in winter. The maintenance schedule is almost opposite: cool-season gets its biggest push in fall, warm-season in late spring.

Most homeowners either do too much in spring (dethatch, power rake, blast with fertilizer, overseed, and spray weed killer all in one month) or too little (wait until the first weekend it’s warm, mow the lawn once, and call it good). The right approach is a paced schedule that works with your grass type, not against it.

This guide covers the full March–May plan for both cool-season and warm-season grass, with the timing, products, and techniques that give you a deep green lawn by Memorial Day.

Start With Your Grass Type

Spring lawn care looks different depending on what you have. The single biggest mistake people make is applying northern-lawn advice to southern grass or vice versa.

Cool-Season Grasses (Northern US)

• Kentucky bluegrass, tall fescue, fine fescue, perennial ryegrass
• Grow best at 60-75°F — peak growth is April and October
• Go semi-dormant in summer heat
• Spring goal: wake the lawn gently, prevent weeds, light fertilizer
• Big push is in FALL, not spring

Warm-Season Grasses (Southern US)

• Bermuda, zoysia, St. Augustine, centipede, bahia
• Grow best at 75-90°F — peak growth is June–August
• Go fully brown/dormant in winter
• Spring goal: wake the lawn aggressively, feed heavily, pre-emergent
• Big push IS in spring — this is when the grass starts growing

If you’re not sure which type you have, a quick test: dormant cool-season grass stays green through mild winters; warm-season grass goes tan/brown. If your lawn was brown all winter and is now starting to green up at the base, it’s warm-season.

The March–April–May Schedule

Early March: Soil Test + Assessment

Walk the lawn as soon as snow is gone. Note:

• Bare spots — mark for seeding later
• Matted dead grass — may need dethatching
• Weeds — dandelions, clover, crabgrass patches from last year
• Drainage issues — standing water, soggy patches
• Color — yellowing suggests nutrient deficiency

Pull a soil test with a basic soil test kit ($15-$25) or send a sample to your state extension office ($10-$30). This tells you soil pH and nutrient levels — the most important data for the whole season. Cool-season grass wants pH 6.0-7.0. Warm-season wants 5.5-6.5 for St. Augustine, 6.0-7.0 for Bermuda and zoysia.

Acidic soil (low pH): apply pelletized lime. Most northern lawns need 20-40 lbs per 1,000 sq ft once a year.

Alkaline soil (high pH): apply elemental sulfur. Common in arid west.

Mid-to-Late March: Cleanup and Dethatching

• Rake out leaves, sticks, and matted dead grass with a stiff spring rake
• Check the thatch layer — push aside live grass and measure. Under 1/2 inch is healthy and doesn’t need removal
• Dethatch only if needed. Small areas: thatching rake ($20-$40). Large yards: rent a power dethatcher ($75-$125/day)

Dethatch on a dry day when grass is still dormant — tearing out wet turf damages healthy crowns.

Warning: never “power rake” a lawn that doesn’t need it. Many spring services automatically include this service even when the thatch layer is thin. You can easily tear out healthy grass and create a weed-friendly soil surface.

Early April: Pre-Emergent Herbicide

This is the single highest-ROI spring treatment. Pre-emergent herbicide prevents crabgrass and other annual weed seeds from germinating.

Timing is critical:

• Apply when soil hits 55°F for 3-5 consecutive days at 2-3 inch depth
• Too early = wastes product (pre-emergent breaks down before seeds germinate)
• Too late = crabgrass is already growing, pre-emergent won’t help

Use a soil thermometer ($10-$15) — far more accurate than calendar dates. Alternative: watch for forsythia blooms. When forsythia is in full yellow bloom, soil has reached 55°F.

Products: Scotts Halts, Preen Lawn Crabgrass Control, or generic prodiamine. Apply with a broadcast spreader at the labeled rate. Water in with 1/4-1/2 inch within 24 hours.

Critical rule: if you plan to overseed in the next 60 days, SKIP pre-emergent. It blocks grass seed germination too.

Mid-April: First Mow

When grass reaches 3-4 inches, make the first cut.

• Set mower height to the tallest setting (3.5-4 inches for cool-season, 2-2.5 inches for warm-season)
• Sharpen the blade first — dull blades shred grass tips, stressing the lawn and creating ragged edges that invite disease
• Don’t bag — mulched clippings return moisture and nitrogen equivalent to ~1 fertilizer application per year
• The 1/3 rule — never remove more than 1/3 of the blade height in one mow

If your lawn is tall (5+ inches) from overwinter growth, cut it in two passes a week apart rather than scalping in one mow.

See our best lawn mowers for homeowners guide for picks ranging from $140 corded electric to $4,500 robot mowers.

Late April: Aerate (If Needed)

Core aeration removes 2-4 inch plugs of soil to relieve compaction. Signs your lawn needs it:

• Footprints visible in the turf after walking
• Water pools on high-traffic areas
• Thatch layer over 1/2 inch
• Clay-heavy soil
• Heavy foot traffic or pet use

Rent a core aerator from a rental center ($50-$100/day) or pay a lawn service $75-$150 for a standard 5,000 sq ft lawn — see our lawn aeration cost guide for full DIY vs pro pricing. Skip spike aerators (the shoe/roller kind) — they compact rather than relieve compaction.

Aerate when the soil is slightly moist, not soaked or dry. Leave the soil plugs on the lawn — they break down in 1-2 weeks.

Late April to Early May: First Fertilizer

The first fertilizer feeds the spring growth push.

Cool-season grass:

• Slow-release nitrogen formulation (look for “SRN” or “Nitroform” on the label)
• Ratio around 20-5-10 or 24-0-10 (N-P-K)
• ~1 lb of nitrogen per 1,000 sq ft
• Products: Milorganite (organic), Scotts Turf Builder, Espoma Organic Lawn Food

Warm-season grass:

• Higher nitrogen for aggressive spring growth
• Ratio around 15-0-15 or 16-4-8
• 1-1.5 lbs of nitrogen per 1,000 sq ft
• Products: Scotts Southern Turf Builder, Pennington Ultragreen

Apply with a broadcast spreader at the labeled rate. Water in with 1/2 inch of water within 48 hours. Do not apply fertilizer before a heavy rain — runoff wastes product and pollutes waterways.

For a full deep-dive on fertilization timing and products, see our how to fertilize your lawn guide.

Mid-May: Spot-Seed Bare Areas

Small bare patches (under 2 sq ft each) can be fixed in spring. Full-lawn overseeding should wait for fall if you have cool-season grass.

Process:

1. Scratch the bare spot with a rake to loosen the top 1/2 inch of soil
2. Spread grass seed matched to your lawn at 8-12 seeds per square inch
3. Cover with 1/4 inch of topsoil or peat moss to retain moisture
4. Tamp gently with the back of a rake
5. Water lightly 1-2 times per day for 2-3 weeks until germination

Spring-seeded cool-season grass is vulnerable to summer heat. Keep the new grass lightly watered through June while it establishes.

Late May: Pre-Summer Transition

Raise the mowing height to 3.5-4 inches for cool-season grass, 2-3 inches for warm-season. Taller grass:

• Shades the soil (retains moisture)
• Crowds out weeds
• Develops deeper roots (more drought-resistant)

Second fertilizer application for warm-season grass (skip this for cool-season — a second dose in late spring pushes growth into summer heat stress).

Check the irrigation schedule. By late May, most lawns need 1-1.5 inches of water per week (rain + irrigation combined). A smart sprinkler controller adjusts automatically based on local weather.

Sharpen the mower blade — if you haven’t yet this season, now is the time. A mower blade sharpener ($15-$30) pays for itself after two seasons.

The Spring Lawn Mistakes Everyone Makes

1. Scalping the first mow. Cutting to 1.5-2 inches exposes soil, stresses grass, and invites weeds. Set the mower high for the first cut.

2. Applying pre-emergent AND overseeding. The pre-emergent blocks the new grass seed from germinating. Pick one or the other.

3. Over-watering early. Cool spring soil doesn’t evaporate water quickly. Watering every day creates shallow roots. Deep and infrequent (1 inch, once or twice a week) is always better.

4. Fertilizing too early. Applying fertilizer before the grass is actively growing wastes product and can burn dormant turf. Wait until you’ve mowed twice.

5. Skipping the soil test. Guessing at fertilizer ratios without a pH reading is the most common reason lawn programs underperform. Acidic or alkaline soil locks up nutrients no matter how much you apply.

6. Dethatching a healthy lawn. Most lawns don’t need dethatching. Unless the thatch is over 1/2 inch thick, leave it alone.

7. Using the wrong grass seed. Planting cool-season seed in a warm-season lawn (or vice versa) creates patches that die in the first temperature shift. Match the seed type to your existing lawn.

When to Hire a Pro

Most homeowners can handle the full spring schedule DIY. Consider hiring out if:

• Soil test shows heavy amendment needed (more than 40 lbs of lime per 1,000 sq ft)
• Lawn has chronic disease (brown patch, dollar spot, red thread) — a pro can diagnose and treat
• You have 1+ acre — the time savings add up fast at scale
• Moles, voles, or grubs are widespread — integrated pest management is complex

Expect to pay $300-$800 for a full professional spring program (3 applications + optional aeration) on a typical residential lawn.

What’s Next: The Summer Plan

A well-executed spring sets up summer for easy maintenance:

• Mow weekly at the tall setting
• Water deeply once or twice a week, early morning
• Spot-treat weeds as they appear with a selective herbicide
• Skip fertilizer during peak summer heat for cool-season grass (burns the lawn)
• Watch for grub damage in August — patches that lift like carpet

Fall is where cool-season grass gets its real reset — overseeding, aeration, winterizer fertilizer. For warm-season grass, fall is wind-down (reduce mowing and watering, no fertilizer after mid-September).

Related Reading

• How to Fertilize Your Lawn — product choice + application technique deep-dive
• Best Lawn Mowers for Homeowners — 9 picks from $140 to $5,500
• Best Smart Sprinkler Controllers — automate irrigation for a green lawn with less water
• Spring Home Maintenance Checklist — non-lawn spring tasks
• How to Power Wash Your House — another spring essential
• Best Leaf Blowers for Homeowners — for the spring cleanup step
• Sprinkler System Installation Cost — in-ground irrigation pricing