Spring lawn care depends on your grass type and region. Cool-season grasses (like Kentucky bluegrass and fescue) wake up early when soil hits 50-55°F, while warm-season grasses (like Bermuda and St. Augustine) stay dormant until soil reaches 65-70°F.
The key is timing your lawn care—mowing, fertilizing, and applying pre-emergents—to match when your grass actually starts growing. Fertilize dormant grass and you’ll waste money or burn your turf. Mow too early and you’ll stunt growth.
This guide breaks down what to do each month based on your region and grass type. If you’d rather skip the DIY approach, Lawn Love’s lawn care pros can handle mowing, fertilizing, and weed control for you.
| Key Takeaways |
|---|
| • Cool-season grass greens up when soil reaches 50-55°F (March in transition zones, April in northern states) • Warm-season grass needs 65-70°F soil temps (late April-May in most areas) • Apply pre-emergent herbicides before soil hits 55°F to stop crabgrass • Wait until grass is 50%-70% green before first mow or fertilization • Cool-season lawns need nitrogen-rich fertilizer; warm-season lawns need balanced formulas |
Spring lawn care calendar
Here’s what to do each month based on your region and grass type:
| Month | Northern Cool-Season | Transition Zone Cool-Season | Transition Zone Warm-Season | Southern Warm-Season |
|---|---|---|---|---|
| March | • Rake and spread snow • Remove debris | • Remove debris • Apply pre-emergent herbicides • Mow to the recommended height once grass starts growing • Water lightly • Test soil • Apply the first round of nitrogen-rich fertilizer | • Remove debris • Apply pre-emergent herbicides | • Remove debris • Mow to the recommended height once grass starts growing • Apply pre-emergent herbicides • Water lightly |
| April | • Mow to the recommended height • Water lightly • Apply pre-emergent herbicides | • Keep mowing at the recommended height • Water 1 to 1.5 inches per week | • Mow to the recommended height • Water lightly | • Mow more frequently • Water 1 to 1.5 inches per week • Test soil • Apply balanced fertilizer |
| May | • Mow more frequently • Water 1 to 1.5 inches per week • Use post-emergent herbicides | • Mow more frequently • Keep watering 1 to 1.5 inches per week • Apply the second round of nitrogen-rich fertilizer • Use post-emergent herbicides | • Mow more frequently • Water 1 to 1.5 inches per week • Use post-emergent herbicides | • Keep mowing at the recommended height • Use post-emergent herbicides |
How weather and temperature affect grass growth
Soil temperature matters more than air temperature for grass growth. Check it by inserting a soil thermometer 3-4 inches deep in both sunny and shaded spots. Take readings mid-morning (8-10 am) for at least 2-3 days since temperatures fluctuate.
Cool-season grass
- Wakes up at: 50-55°F soil temperature
- Active growth: 60-75°F
- Goes dormant: Below 50°F
- Growth season: Spring and fall
Cool-season grasses like Kentucky bluegrass, fescue, and ryegrass thrive in northern and central regions. They green up early in spring, slow down in summer heat, then surge again in fall.
Warm-season grass
- Wakes up at: 65-70°F soil temperature
- Active growth: 80-95°F
- Goes dormant: Below 65°F
- Growth season: Late spring through summer
Warm-season grasses like Bermuda, Zoysia, and St. Augustine dominate southern regions and the transition zone. They stay dormant longer into spring and only green up when soil consistently hits 65°F.
Cool-season lawn care in northern regions
Northern states experience long winters and slow spring warm-ups. Don’t rush to mow or fertilize—wait for consistent growth.
March
Spread snow evenly with a rake to prevent uneven green-up and snow mold. After snow melts (usually mid-March), remove leaves, sticks, and debris.
April
Kentucky bluegrass, fescue, and ryegrass start growing fast. Mow to the recommended height but never remove more than one-third of the blade—cutting too short stresses grass and invites weeds.
Water lightly once or twice weekly if there’s no rain, keeping soil moist but not saturated.
Apply pre-emergent herbicides to prevent crabgrass germination.
May
Increase mowing frequency to about 6 times monthly as temps reach 60-75°F. Test your soil and apply nitrogen-rich fertilizer.
Cool-season grass needs 1-1.5 inches of water weekly (including rainfall). Water deeply twice a week rather than lightly every day to encourage deep root growth.
Hand-pull broadleaf weeds like clover and plantain immediately. If there are too many, use post-emergent herbicides containing 2,4-D, dicamba, or triclopyr.
Read more:
- How to Mow a Lawn the Right Way
- What’s the One-Third Rule of Mowing?
- When to Apply Pre-Emergent Herbicides
- How to Apply Pre-Emergent Herbicides
- When Is the Best Time to Water Your Grass?
- How Long Should You Water Your Lawn?
- When to Apply Post-Emergent Herbicides
- How to Apply Post-Emergent Herbicides
Cool-season lawn care in the transition zone
Transition zone areas warm up faster in spring, so cool-season grasses green up earlier than in the northern regions. But there can still be some fluctuations in temperature, so wait until you see real grass growth before taking any major actions.
March
Remove debris after the last snowfall. Apply pre-emergent in mid-March before soil warms enough for weed germination.
Cool-season grass usually starts growing in late March. Mow to the recommended height once you confirm growth.
Test your soil and apply the first round of nitrogen-rich fertilizer. Water lightly before and after fertilizing to help nutrients soak in.
April
Keep mowing weekly and water 1-1.5 inches per week for healthy growth.
May
Increase mowing to twice weekly when temps reach 60-75°F.
Apply a second nitrogen-rich fertilizer. Hand-pull weeds like clover or dandelions immediately, or use post-emergent herbicides if they’ve spread.
Read more:
- How to Test Your Lawn Soil: DIY vs Lab Methods
- What is N-P-K: A Guide to Understanding Fertilizer Ratios
- The Best Height to Cut Your Grass
Warm-season lawn care in the transition zone
Transition zones don’t warm enough until May for warm-season grasses to break dormancy. Don’t mow or fertilize too early.
March
In most transition zone areas, temperatures are still cold in March, so your grass will remain dormant. Just remove fallen leaves, twigs, and other debris from your lawn.
Apply pre-emergent herbicide in late March when soil temps stay around 55-60°F for a few consecutive days. In cooler states like Delaware and West Virginia, wait until early-to-mid April.
April
As temps climb into the 60s, grass slowly wakes up. Wait until at least 50% has greened up before mowing (usually late April, or early May in cooler areas).
Mow to the recommended height. Water lightly if there’s no rain to keep soil moist..
May
In early May, temps still range 65-75°F—below ideal growth temperature. By late May, temps hit the 80s in most states.
Start weekly mowing and increase watering to 1-1.5 inches per week (including rainfall).
Hand-pull broadleaf weeds immediately or use post-emergents containing 2,4-D, dicamba, or triclopyr.
Read more:
Warm-season lawn care in southern regions
Southern states warm early, so warm-season grasses green up much sooner than in transition zones.
March
Temps often rise above 60°F in March. You’ll see green patches quickly, but wait until April to fertilize.
Remove debris. Once grass is 50% green, start mowing to the recommended height. Apply pre-emergents to stop crabgrass.
Water lightly if there’s no rain.
April
Temps reach the 80s in most southern regions. Keep mowing regularly and increase watering to 1-1.5 inches weekly (including rainfall).
Mid-April is ideal for fertilizing. Test your soil and apply a balanced fertilizer to strengthen turf for summer heat and drought.
May
Continue regular mowing and watering. If you skipped April fertilization, do it now.
Hand-pull broadleaf weeds like dandelions and clover as they sprout. If they’ve spread, use post-emergent herbicides.
How to manage mixed lawns
Mixed lawns (both cool- and warm-season grass) are common in transition zones. One grass grows while the other stays dormant, so you need to balance care for both.
Adjust mowing for growing grass
Cool-season grasses green up early March in transition zones. Mow at 4 inches to avoid cutting dormant warm-season grass. Keep this height until mid-April when warm-season grasses wake up.
By late May, both grass types grow actively. Mow at a height that works for your dominant species.
Hold off on fertilizing until May
Cool-season grasses grow well in late March, but don’t fertilize yet—it pushes them too hard while warm-season grass stays dormant. Wait until early May when warm-season grasses green up, then apply slow-release fertilizer.
If your lawn is mostly cool-season grass, use nitrogen-rich fertilizer for spring growth. If warm-season grass dominates, use balanced fertilizer for steady growth and summer strength.
Adjust watering gradually
Water lightly in late March as cool-season grasses start growing to keep soil moist. As temps reach the 60s in mid-April, increase to about an inch weekly. Gradually increase to 1.5 inches weekly (including rainfall) by mid-May.
Watch out for weeds
Mixed lawns attract more weeds because one grass type is always weaker. Apply pre-emergents in early spring to prevent crabgrass.
Broadleaf weeds like dandelions and clover appear in late May. Hand-pull them immediately or apply post-emergent herbicides containing 2,4-D, dicamba, or triclopyr if they’ve spread.
Read more:
FAQs
No. Cool-season grasses need fertilizer in early spring (March-April) when actively growing, while warm-season grasses should be fertilized in late spring (April-May) after they’ve broken dormancy. Fertilizing at the wrong time wastes nutrients and can damage grass.
Check blade height over 3-4 days. If blades are noticeably taller, your grass is actively growing. If it’s just changing color but not getting taller, it’s still waking up—wait to mow or fertilize.
For cool-season grass, spring aeration works if you have compaction issues, though fall is better. For warm-season grass, wait until late spring or early summer when it’s actively growing. Never aerate dormant grass.
Yes, pre-emergents only prevent seeds from germinating—they won’t kill existing weeds. If weeds have already sprouted, you’ll need post-emergent herbicides instead. Apply pre-emergent earlier next season before soil temps hit 55°F.
Get professional spring lawn care
Spring lawn care timing is everything. Mow, fertilize, or apply pre-emergents at the wrong time and you’ll stress your grass instead of helping it thrive.
Lawn Love’s local lawn care pros know exactly when to care for your grass type and region. We handle mowing, fertilization, weed control, and aeration—all at a price you’ll love. Get a free quote in seconds.
Main Image: Healthy green spring lawn with surrounding trees. Image Credit: Fangzhou / Adobe Stock
Related Posts:
