Spring Lawn Prep: What to Do in March & April in Upstate SC

Spring in Upstate SC moves fast — and it waits for no one. The window between a late frost and the real heat of summer is short, which means the timing of your spring prep work matters more here than almost anywhere else in the Southeast.

When to Start Mowing in Upstate SC

Most lawns in Spartanburg County are warm-season grasses — Bermuda, Zoysia, or centipede — which means they don't green up until soil temps hit around 55°F. For our area, that typically happens in late March to mid-April depending on the year. Resist the urge to mow dormant grass. Wait until you see at least 50% green coverage before you start the season.

Pre-Emergent Timing Is Critical

Pre-emergent herbicide needs to go down before crabgrass and summer annual weeds germinate — which happens when soil temps hit 55°F. In Boiling Springs and Inman, that's typically late February to mid-March. Apply too late and you've missed the window. Soil thermometers are cheap and worth using.

First Fertilization: Don't Rush It

For warm-season grasses, hold off on the first nitrogen application until the lawn has fully greened up — usually mid to late April. Fertilizing dormant grass feeds the weeds, not the turf. For fescue lawns (more common in shaded yards), a light spring application in early March is fine.

Mulch Refresh and Bed Prep

Spring is the right time to refresh mulch in plant beds — add 2–3 inches to suppress weeds and retain moisture going into summer. Pull or treat any winter weeds that have established in beds before you mulch over them.

Irrigation Startup Checklist

Before running your system for the first time, walk every zone and check for cracked heads, misaligned rotors, and leaks at valve boxes. Winter freeze-thaw cycles in the Piedmont can crack PVC fittings even without a hard freeze. Catch problems now before you're watering your driveway all summer.