You generally stop cutting your grass when it stops growing regularly , not on a specific calendar date, which usually lines up with cooler fall weather and the first frosts in your area.

Key rule of thumb

  • Most lawns can be mowed as long as they are still actively growing and the ground is not frozen or frosty.
  • Once you go a week or more and the mower bag is almost empty or you barely see clippings, that is a strong sign growth has essentially stopped and you can put the mower away.

Temperature and grass type

  • Cool‑season grasses (fescue, ryegrass, Kentucky bluegrass) usually stop needing cuts once daytime air temperatures are consistently around or below 50°F (about 10°C) and soil temps dip under that level.
  • Warm‑season grasses (Bermuda, Zoysia, St. Augustine, Centipede) are usually done once daytime temps sit below about 60°F (15–16°C) and nights are in the 50s.

Typical end‑of‑season timing

Exact timing depends on your climate, but many lawn guides point to:

  • Late October to early November for many cooler northern areas.
  • Late September through October in warmer southern regions where warm‑season grasses go dormant earlier.

If autumn is unusually mild, you might mow into mid‑November, as long as the grass is still growing and there is no hard frost on the lawn.

What your “last mow” should look like

  • Aim for a slightly shorter final cut: about 2–2.5 inches for cool‑season lawns and roughly 1.5–2 inches for warm‑season lawns.
  • Do that final cut before the first hard frost and while the soil is dry; never mow when the grass is frosty or frozen, because it can split and damage the blades and invite disease.

In one line: Stop cutting your grass once temperatures stay cool (around 50–60°F and below), growth has nearly stopped for a week or more, and you are just before or at the first hard frost of the season.

Information gathered from public forums or data available on the internet and portrayed here.