Mowing Lawn Heights for Winter

Mowing Basics

• Mowing heights differ from grass species to grass species, but in general, the University of Ohio Extension recommends the "one-third rule" for mowing all grasses. Grass should always be mowed so that no more than one-third of the leaf blade is cut off during a single mowing. For example, if you like the look of your grass when it grows to 3 inches, the grass should never be mowed to remove more than the top 1 inch. Observing this rule to the best of your ability will ensure healthy and vigorous lawn grass growth.

Winter Mowing

• Mowing should continue with careful observance of the one-third rule for as long into the fall as the grass continues to grow. As fall becomes winter, however, lowering the mowing height further is advisable which is a particularly important step if your species of lawn grass is prone to lawn diseases since lawns tend to contract more diseases during the winter months.

A Note on Grass Species

• As with other generalized plant guidelines, homeowners must allow for some deviation in light of the individual species of grass they are growing in their lawns. Ryegrass, for instance, should be mowed more frequently in the winter than should Kentucky bluegrass, fine fescue and tall fescue. Conversely, tall fescue should be kept taller during winter than should Kentucky bluegrass, ryegrass or fine fescue which presents just a handful of examples of some of the most common types of grass grown residentially. If you are unsure of winter mowing recommendations for your specific species of grass, consult a local university extension service for the best species-specific advice on the matter.

Other Considerations

• Mowing heights are more than just an aesthetic concern to the responsible homeowner. Taking off more than one-third of the grass blade with a mower can damage the grass's roots. Not only will a significant time investment be required to save your grass, but damaged roots leave the grasses more susceptible to infection from diseases. Observing the one-third rule also keeps grass clippings small enough that they will not pile up on the lawn and block the grass from obtaining sunlight.