The 1/3 rule in lawn care means never cutting more than one-third of the grass blade's height during a single mow. This practice helps maintain a healthy leaf surface for photosynthesis, reducing stress on the grass and promoting resilience against pests and drought. It also encourages deeper root growth by shading the soil and retaining moisture. If you miss a mowing session and the grass grows longer, continue to follow the 1/3 rule to gradually reduce the height without damaging the lawn. Adhering to this rule ensures a lush, healthy lawn in Colorado over time.
Understanding the 1/3 Rule in Lawn Mowing

The 1/3 rule is a simple guideline for mowing your lawn: never remove more than one-third of the grass blade's height in a single mowing session. This means if your grass is three inches tall, you should cut it down to no less than two inches. The rule helps ensure that your grass remains healthy and resilient.
By following the 1/3 rule, you avoid stressing your grass, which can occur when too much of the blade is removed at once. This practice helps maintain the grass’s natural growth processes and keeps it strong and vibrant. It’s a straightforward yet effective way to promote a healthy lawn.
How does the 1/3 mowing rule benefit your lawn?
Applying the 1/3 rule when mowing has several benefits for your lawn's health. First, it helps maintain a sufficient leaf surface area, which is essential for photosynthesis. The grass blades capture sunlight and convert it into energy, fueling growth and keeping the grass green and healthy. Removing too much of the blade reduces this surface area, hindering the grass's ability to produce energy.
Moreover, the 1/3 rule helps prevent the grass from becoming stressed. Cutting too much at once can shock the grass, making it more susceptible to diseases, pests, and drought. By only removing a small portion of the blade, you allow the grass to recover quickly and continue growing strong. Additionally, maintaining the right height helps shade the soil, reducing water evaporation and keeping the roots cool. This promotes deeper root growth, which enhances the grass's ability to access nutrients and water, leading to a more robust lawn.
What if you skip a week of mowing?
Life can get busy, and sometimes you might miss a week of mowing, resulting in longer grass than usual. In this situation, it’s still important to adhere to the 1/3 rule. Even if your grass has grown significantly, resist the temptation to cut it back to its usual height in one go. Instead, remove only one-third of the blade length.
After following the 1/3 rule, your grass will still be a bit longer than ideal, but this gradual approach prevents stress and damage. In the following week, you can mow again, removing another one-third of the blade. By continuing this process, you’ll gradually bring your lawn back to the desired height without compromising its health. This method ensures that your lawn remains strong and healthy, even if it takes a little longer to return to its ideal state. Patience and consistency are key to maintaining a vibrant lawn.
Call Us Today to Sign Up For Our Lawn Mowing Service
Observing proper mowing practices is key to ensuring your grass gets the most out of the practice without experiencing stress. Here at Total Turf Lawn Care, we offer a lawn mowing service that includes string-trimming, edging, and blowing debris off hard surfaces to ensure your property looks neat after our visit! Our team follows a weekly mowing schedule that runs from mid-April until the end of October. We provide this service for homeowners and business owners, as well as HOAs, in Longmont, Niwot, Frederick, CO, and surrounding cities. Call us today at (720) 343-9845 to sign up for this service and keep your lawn looking manicured year-round!
