The Maryland Spring Lawn Care Calendar (Week-by-Week)

Cool-season lawns in Maryland — fescue, bluegrass and perennial rye — wake up fast in Montgomery County. By the time you’ve seen your first daffodil, the soil temperature is already creeping past 50°F and the grass is pushing roots that will determine whether your lawn looks great in July or stops at the first heat wave.

Here’s the exact week-by-week schedule we follow on the 320+ properties we maintain across Olney, Bethesda, Rockville and Silver Spring. You can do most of it yourself; the rest is what professional lawn-care services exist for.

Late February to early March: clean and assess

Don’t touch the lawn while it’s still soggy — you’ll compact wet clay soil and leave footprints that linger for months. Wait for a dry day, then walk the property with three things in mind:

• Snow-mold patches — gray or pink circles, especially on north-facing slopes. Lightly rake to break the matted thatch and let air in.
• Vole runways — surface tunnels visible through dead winter grass. Tamp them down; the grass usually recovers.
• Bare and thin areas — note these for overseeding later. Take photos.

Mid-March: the first cleanup pass

This is when we book our spring cleanups. The work is simple but important:

• Cut back ornamental grasses to 4–6″ before new growth pushes up
• Remove leaves and debris from beds (don’t bag — compost!)
• Edge bed lines with a sharp spade for that crisp natural look
• Light pre-emergent application only if you have a history of crabgrass — soil temps need to be 50–55°F at 4″ depth, which in Montgomery County typically means around forsythia bloom

“The single biggest spring mistake we see is people fertilizing in February. Cool-season grass doesn’t want food yet — it wants light, air and a little patience.”

Late March to early April: first mow

Wait until the grass is actively growing and you can mow at the proper height (3.5″) without scalping. The first mow should remove no more than one-third of the blade. Sharpen the mower blade first. A dull blade tears grass, leaves brown tips and invites disease — it’s the difference between a lawn that recovers and a lawn that limps through July.

April: feed and seed

Apply a slow-release nitrogen fertilizer — we use a 24-0-6 with 50% slow-release. If you want to overseed thin spots, this is also the window: temperatures are right, rain is regular, and the grass has six good weeks to establish before summer stress.

Tip: don’t apply pre-emergent in any area you intend to overseed. The same chemistry that stops crabgrass also stops grass seed.

May: aerate, edge, and stay ahead of weeds

Spring core aeration relieves compaction and is the single highest-ROI thing you can do for Maryland clay soil. Pair it with a top-dress of compost and a light overseed and you’ll see results all summer.

• Mow weekly at 3.5–4″
• Spot-spray broadleaf weeds (dandelion, plantain) only where needed
• Apply a second feeding around Memorial Day if growth is slowing
• Edge beds again — you’ll be amazed how much it sharpens the look

What to skip

Three things we see homeowners do every spring that hurt more than help:

1. Power-raking healthy turf. Unless you have a true thatch problem (more than ½″), it just rips up living grass.
2. Fertilizing too early or too heavily. Cool-season turf doesn’t want a big shot of nitrogen in February — it wants slow, steady food.
3. Mowing too short. Anything below 3″ in Maryland summer is a recipe for crabgrass. The taller blade shades the soil and out-competes weeds naturally.

The seasonal rhythm

If you remember nothing else: March = clean, April = feed, May = grow. Match the rhythm and your lawn will carry itself through July and August with very little drama.

If you’d rather skip all of it and have someone else handle it on schedule — we book about 80% of our spring slots by mid-February. Reach out and we’ll get you on the calendar.