The dates you'll see online for the first mow of the year are almost always wrong for where you actually live. A national average doesn't mean much when one suburb is in growing zone 4 and another two states away is in zone 9. The right approach: watch the grass, not the calendar.
The first mow of the season
Three signals tell you the lawn is ready for its first cut:
- Active growth. Grass blades are standing up and reaching, not just thawed and laying down. Color is shifting toward green.
- Soil firmness. Walk across the lawn. If your shoes leave imprints, the ground is too soft and you'll compact it.
- Height around 4 inches. Cool-season grasses (most of the northern US) hit this point first; warm-season grasses (southern US) follow later in spring.
If all three are true, mow. If any one is missing, wait another week.
Set the blade high
The single most common mistake on the first mow is cutting too short. Scalping the lawn in spring invites crabgrass, weakens the root system, and leaves bare patches that take months to recover.
Set the deck to 3.5 to 4 inches for cool-season lawns, 2 to 3 inches for warm-season lawns. Use the one-third rule — never cut more than one-third of the grass blade in a single mow.
Through the summer
During peak season — May through July across most of the country — most lawns need weekly mowing. Drought and heat slow growth; let the lawn tell you. If the grass is going dormant in late summer, it's protecting itself. Don't mow dormant lawns aggressively.
Sharp blades matter more than schedule
A dull mower blade tears grass instead of cutting it, leaving frayed brown tips and stressed plants. Sharpen the blade twice per season — once at the start and once in midsummer. Five minutes of work that improves the look of your lawn more than fertilizer does.
The last mow of the season
The right time to stop mowing is when growth essentially halts — usually after the first hard frost, or when daytime temperatures consistently sit below 50°F.
For the final cut of the year, drop the blade height a notch (around 2.5 inches for cool-season grass). Shorter grass over winter reduces snow mold and limits how much organic material mats down under snow.