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About this tool
Plan mowing frequency, cutting height and season workload by grass type, season, shade and lawn care level.
This planner turns the turfgrass one-third rule into a mowing schedule: because a single cut should never remove more than a third of the leaf blade, grass cut at height H is mown once it reaches 1.5 × H, and the interval is that allowance divided by the daily growth rate. It combines each grass type's published cutting-height range with season, shade and how hard the lawn is fed and watered. It is aimed at homeowners and grounds staff planning a season's work rather than reacting week by week.
Open Lawn Mowing Schedule Planner on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
The interval falls out of the agronomy, not a fixed 'mow every Saturday' habit.
Shows the published cutting range for nine common grasses so you do not scalp the lawn.
Converts mower width and walking speed into minutes per cut and hours per season.
Whenever the grass is one and a half times your cutting height — for Kentucky bluegrass cut at 5.7 cm in spring that works out at roughly every 6 days. In summer heat cool-season grass slows down and the same lawn can go two weeks or more between cuts.
Never remove more than one third of the grass blade in a single cut. Taking more shocks the plant, exposes stems and reduces root depth, so if the grass has got away from you, lower the blade in stages over several cuts.
It depends on the species: Bermuda is cut at 1.3–3.8 cm, Kentucky bluegrass at 3.8–7.6 cm, tall fescue at 5–10 cm and St. Augustine at 6.4–10 cm. Raise the blade towards the top of the range in summer heat and in shade so the canopy keeps the soil cool.
Cool-season grasses grow at roughly 45% of their spring rate in summer heat, so cuts naturally spread out — but warm-season grasses like Bermuda and Zoysia peak in summer and need mowing more often then. Avoid mowing drought-stressed grass at all until it has been watered or has had rain.