Your Complete Spring Lawn Care Checklist (Month-by-Month)
Spring lawn care doesn't have to feel overwhelming — it just needs to happen in the right order. This month-by-month checklist walks you through exactly what to do in March, April, and May for both cool-season and warm-season grasses, so you're always working with your lawn instead of against it. From pre-emergent timing to fertilizing to mowing, here's everything you need to have a great-looking lawn by summer.
Your Complete Spring Lawn Care Checklist (Month-by-Month)
Published on LawnMaps.com | Estimated read time: 6 minutes
Spring is the most important season for your lawn. What you do — and when you do it — between March and May sets the tone for how your grass looks all the way through summer. Get ahead of it now and you'll spend the rest of the season enjoying your yard instead of fighting it.
This checklist breaks everything down month by month so you always know what to focus on and when. Whether you have a cool-season lawn in the North or a warm-season lawn in the South, we've got you covered.
A Quick Note Before You Start
Not sure what type of grass you have? Here's the simple version:
- Cool-season grasses (Kentucky bluegrass, tall fescue, perennial ryegrass) are common in the northern and mid-Atlantic states. They thrive in spring and fall and go dormant or slow down in summer heat.
- Warm-season grasses (Bermuda, Zoysia, St. Augustine, Centipede) are common in the South and transition zone. They love heat, go dormant in winter, and really get going once temperatures climb.
Some tasks apply to both. Where they differ, we'll call it out clearly.
March — Wake Up and Get Ready
March is about preparation more than application. Your lawn is just starting to stir, and your job this month is to set yourself up for a strong April and May.
✅ Clean Up Winter Debris
Rake up any leaves, sticks, or matted grass that collected over winter. This lets light and air reach the soil and prevents mold and disease from getting a foothold. Don't skip this — it's more important than it looks.
✅ Check Your Soil Temperature
Before you do anything else, check your soil temperature. This is the single most reliable indicator of what your lawn is actually ready for. Products applied before the soil is warm enough won't perform — and in some cases can do more harm than good.
Log into your LawnMaps dashboard to see your current soil temperature updated for your location. You'll know at a glance whether it's time to start your program or wait another week or two.
✅ Cool-Season Lawns: Watch for Your Pre-Emergent Window
As soil temps approach 45–50°F, it's almost time for your first pre-emergent application. Don't wait until it hits 55°F — by then crabgrass seeds may already be germinating and the window is closing. Get your product ready so you can move quickly.
✅ Warm-Season Lawns: Be Patient
If you have Bermuda, Zoysia, or St. Augustine, March is mostly a waiting game. Your grass is still dormant or just barely waking up. Resist the urge to fertilize — you'll just be feeding weeds and potentially stressing grass that isn't ready. Your time is coming in April and May.
✅ Service Your Lawn Equipment
Sharpen your mower blade, change the oil, and make sure your spreader is clean and calibrated. A dull mower blade tears grass instead of cutting it cleanly, which stresses the lawn and opens it up to disease. Do this now before the rush.
✅ Map Your Lawn Zones
If you haven't already measured your lawn and set up your zones, March is the perfect time. Head to LawnMaps.com and trace your zones on the satellite map — front yard, backyard, side strips — to get exact square footage for each area. You'll use these numbers every time you buy and apply product this season so you're never guessing how much you need.
April — Your Busiest and Most Important Month
April is go time. Soil temperatures are rising, grass is actively growing, and the window for some of your most important treatments is open. Stay on top of this month and you'll be in great shape.
✅ Cool-Season Lawns: Apply Your First Pre-Emergent
When soil temps hit the 45–50°F range, apply your first pre-emergent application (half the label rate if you're doing a split program — which we highly recommend). Water it in within 24–48 hours with about ¼ to ½ inch of water.
Two to three weeks later, apply the second half of your pre-emergent to extend your protection window through peak crabgrass germination season.
✅ Warm-Season Lawns: Apply Pre-Emergent Too
Warm-season lawns need pre-emergent as well — just a little later, as soil temps in your region will take longer to climb. Aim for application once your soil is consistently in the 50–55°F range. Same split-application approach applies here.
✅ Cool-Season Lawns: First Fertilizer Application
Once soil temps are consistently in the 55–65°F range, your cool-season grass is actively growing and ready to be fed. Apply a balanced fertilizer (one with a solid nitrogen level — that's the first number on the bag) to fuel healthy green growth.
Use your LawnMaps zone measurements to calculate exactly how much product each section of your lawn needs. This prevents over-applying in smaller zones and under-applying in larger ones.
✅ Start Mowing
As soon as your grass is actively growing, get on a regular mowing schedule. For most lawns, that means mowing once a week in spring.
A few rules to follow:
- Never cut more than one-third of the grass blade at a time — cutting too much at once stresses the plant
- Cool-season grasses do well at 3–4 inches in height
- Warm-season grasses are typically kept shorter, around 1.5–2.5 inches depending on the variety
✅ Address Bare Spots — Cool-Season Lawns Only
If you have bare or thin patches and you're not applying pre-emergent, April is a decent time to overseed cool-season lawns. Keep in mind that pre-emergent and grass seed don't mix — the product can't tell the difference between a weed seed and a grass seed. If you've applied pre-emergent, hold off on seeding until fall.
✅ Test Your Irrigation System
Turn on your sprinkler system and check for broken heads, leaks, or uneven coverage. Fix issues now before you actually need it in the heat of summer. If you hand-water, this is a good time to make sure your hose and sprinkler are in good shape.
May — Lock It In and Stay Consistent
By May, your lawn program is in full swing. This month is about staying consistent, finishing up your spring applications, and starting to think about summer.
✅ Warm-Season Lawns: First Fertilizer Application
May is typically when warm-season grasses are fully out of dormancy and actively growing. Once soil temps are consistently in the 65–70°F range, it's time to feed. Use your zone measurements to apply the right amount — and don't rush it. Fertilizing too early wastes product and can push tender new growth that's vulnerable to a late cold snap.
✅ Cool-Season Lawns: Second Pre-Emergent Application
If you started your split pre-emergent program in April, your second application should fall in early-to-mid May depending on when you applied the first round. Check your LawnMaps dashboard — if soil temps are climbing toward 60°F or above, don't delay.
✅ Watch for Weeds That Slipped Through
No pre-emergent is 100% perfect. If you see a few weeds starting to emerge, spot-treat with a post-emergent weed control product rather than broadcasting herbicide across the whole lawn. Targeted treatment is more effective and easier on your grass.
✅ Adjust Your Watering
Spring rain usually handles most of your lawn's water needs, but as May gets warmer and drier in many regions, you may need to start supplementing. Most lawns need about 1 inch of water per week between rain and irrigation. Water deeply and infrequently rather than a little bit every day — this encourages deeper root growth.
✅ Keep Mowing Consistently
Don't let your lawn get away from you. Stick to your weekly mowing schedule and maintain the right height for your grass type. As temperatures rise in late May, you can raise your mower height slightly for cool-season grasses — taller grass shades the soil and helps retain moisture heading into summer.
✅ Take Stock of How Your Lawn Is Looking
May is a great time to walk your lawn and make notes. Where is it thickening up? Where are the problem spots? Any areas where weeds are winning? Any zones that seem thin or patchy? Jot it down — these observations will guide your fall program when overseeding and soil correction become priorities again.
Your Spring Lawn Care at a Glance
| Task | March | April | May |
|---|---|---|---|
| Clean up debris | ✅ | ||
| Check soil temperature | ✅ | ✅ | ✅ |
| Pre-emergent (1st application) | ✅ | ||
| Pre-emergent (2nd application) | ✅ | ||
| Fertilize cool-season grass | ✅ | ||
| Fertilize warm-season grass | ✅ | ||
| Start mowing | ✅ | ✅ | |
| Overseed bare spots (cool-season, no pre-emergent) | ✅ | ||
| Adjust watering | ✅ | ||
| Service equipment | ✅ | ||
| Map lawn zones | ✅ |
Your Next Step
Spring moves fast — and the biggest mistake homeowners make is waiting too long to start. The good news is you don't need to do everything at once. Just focus on the right task for the right month and you'll stay ahead of it.
Start by checking your soil temperature in your LawnMaps.com dashboard — that one number tells you exactly where you are in the season and what's ready to do next. If you haven't mapped your lawn zones yet, do that at the same time. Five minutes now saves you from buying the wrong amount of product all season long.
Your lawn is ready. Let's go. 🌱