Spring lawn care checklist: the 8 jobs that matter most

Spring is the moment your lawn decides what kind of year it's going to have. Get a handful of jobs right between March and May and you set up a thick, green, weed-resistant lawn for the whole season. Get them wrong — or in the wrong order — and you spend all summer fighting problems you could have skipped. This spring lawn care checklist covers the eight jobs that genuinely move the needle for cool-season grasses (fescue, ryegrass, Kentucky bluegrass, bentgrass), with real timings, real heights and real product names so you know exactly what to do and when.

No filler. Just the stuff that matters, in the order that matters.

The key insight: For cool-season lawns, spring is about waking the lawn up gently — not force-feeding it. The single biggest spring mistake is dumping heavy nitrogen too early, which pushes soft leafy growth at the expense of roots and invites disease. Feed light in spring; save the heavy feeding for autumn.

When is "spring" for your lawn?

Forget the calendar date. Your lawn wakes up when the soil warms, not the air. Two cues beat any date:

• Soil temperature. Cool-season grass starts growing when soil sits around 8–10°C (about 45–50°F). A cheap soil thermometer pushed 5 cm (2 in) deep tells you more than any forecast.
• The forsythia rule. When forsythia bushes are in full yellow bloom in your area, soil temperatures are climbing into the range where crabgrass seeds germinate. That's your pre-emergent alarm clock (more on that below).

Because spring arrives weeks apart across regions, here's a rough guide:

The 8-job spring checklist

1. Rake and clean up

Once the ground is no longer frozen or soggy, give the lawn a gentle spring rake. You're clearing winter debris, dead leaves, twigs and matted grass so light and air reach the crowns.

• Wait until it's dry-ish. Raking a waterlogged lawn tears out healthy grass and compacts the soil.
• Go light. A spring tidy is not a full scarify. Light thatch removal is fine; aggressive dethatching in spring can stress a lawn just as it's waking up.
• Bin any snow-mould patches (matted, greyish-pink circles) so they don't spread.

2. First mow — at the right height

Resist the urge to scalp it. The first cut wakes the grass without shocking it.

• Mow when the grass reaches 6–7 cm (2.5–3 in), taking off no more than the top third.
• Never remove more than one-third of the leaf in a single cut — the "one-third rule" applies all year.
• Set a spring height of 5–6 cm (2–2.5 in) and only lower it gradually over several cuts if you want it shorter.

3. Sharpen the mower blade

Do this before that first mow. A dull blade shreds grass tips, which then turn white-brown and let disease in.

• Sharpen or swap the blade at least once a season — spring is the natural time.
• The tell-tale sign: if your lawn looks frayed and greyish a day after cutting, the blade is blunt.

4. Crabgrass pre-emergent — timing is everything

This is the highest-leverage job on the list, and it's all about timing. A pre-emergent stops crabgrass and other summer annual weeds germinating — but only if it's down before the seeds sprout.

• Apply when forsythia finishes blooming / soil hits ~13°C (55°F), which is just before crabgrass germinates.
• Common active ingredients: prodiamine, dithiopyr and pendimethalin. Dithiopyr has a short window of early post-emergent action; prodiamine is a long-lasting barrier.
• Do not pre-emergent and overseed at the same time. Most pre-emergents stop grass seed germinating too. If you're seeding this spring, skip the pre-emergent (or use a seeding-safe product like siduron/mesotrione and follow the label).

5. Spring feed — light, not heavy

Cool-season grass wants a gentle nudge, not a nitrogen bomb.

• Aim for roughly 0.25–0.5 kg of nitrogen per 100 m² (about 0.5–1 lb per 1,000 sq ft) in spring — half what you'd apply in autumn.
• Choose a slow-release / controlled-release fertiliser so growth is steady rather than a surge you'll be mowing twice a week.
• Wait until the lawn is actively growing (you've had a mow or two) before feeding. Feeding dormant grass just feeds the weeds.

6. Overseed thin and bare areas

Spring is a decent (not perfect — autumn is best) time to thicken thin patches for cool-season grass.

• Rake the bare area to loosen the top layer, sow seed at the label rate, and keep it consistently moist until germination (usually 7–21 days).
• Match the seed to your existing lawn (fescue with fescue, rye with rye) so it blends.
• Remember the pre-emergent conflict from job 4 — you can't do both in the same spot.

7. Aerate if the soil is compacted

Only if you need it. Aeration relieves compaction and lets water, air and nutrients reach the roots.

• The test: push a screwdriver into moist soil. If it's hard work, you're compacted.
• Core (hollow-tine) aeration pulls out plugs and beats spike aeration for real relief.
• Autumn is generally the prime time, but spring aeration is fine for badly compacted, high-traffic lawns — just pair it with overseeding, not pre-emergent.

8. Adjust your watering

Spring rain does a lot of the work, so don't overwater.

• Aim for about 2.5 cm (1 in) of water per week total, rain included — let nature top up the rest.
• Water deeply and infrequently to train roots downward, rather than a daily light sprinkle.
• Water in the early morning so blades dry through the day, reducing disease risk.

Frequently asked questions

When should I start lawn care in spring?

Start when your soil reaches around 8–10°C (45–50°F) and the grass begins actively growing — usually when forsythia starts blooming in your area, not on a fixed calendar date. That's anywhere from early March in the mild south to May in colder northern regions.

Should I fertilise my lawn in early spring?

Only lightly, and only once the grass is actively growing. Heavy early nitrogen forces soft top growth at the expense of roots and invites disease, so use a slow-release feed at about half your autumn rate.

When should I apply crabgrass pre-emergent?

Apply when forsythia finishes blooming and soil temperatures reach about 13°C (55°F) — just before crabgrass germinates. Products with prodiamine or dithiopyr are common; put it down before the weeds sprout, because pre-emergents don't kill established weeds.

Can I overseed and use pre-emergent at the same time?

No — most pre-emergents stop grass seed germinating along with the weeds. Choose one per area this spring, or use a seeding-compatible product like mesotrione and follow the label timing.

How short should I cut my lawn in spring?

Keep cool-season grass at about 5–6 cm (2–2.5 in) and never remove more than a third of the blade in one mow. Cutting too short weakens the roots and hands the advantage to weeds.

How Lawnova builds this into your plan

The tricky part of spring lawn care isn't the jobs — it's the timing, and timing depends on your grass type, your region and even this year's weather. Lawnova turns this checklist into a personalised schedule: it tells you when your soil is warm enough for the first mow, pings you when it's pre-emergent o'clock for your postcode, works out your light spring feed rate, and keeps overseeding and pre-emergent from clashing. You get the right job, at the right time, for your exact lawn — no guesswork, no calendar-watching.

Get your free Lawnova plan

Here's to a greener spring — your lawn will thank you.