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Fall is the best time to overseed a lawn or repair thin or bare areas. Cool nights and mild, shorter days provide the ideal conditions for seed germination. Grass seed is better able to retain moisture during the fall, and seedlings will thrive without the extreme heat that occurs in the summer months. 

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Reasons to Overseed

A lawn that's never overseeded tends to grow old. If it is consistently mowed, it doesn’t even have the opportunity to go to seed to propagate itself. The lawn will have to rely on rhizomes, stolons, and tillering for growth. Eventually, an old lawn will have trouble maintaining vigorous growth, competing with weeds, and dealing with other lawn stresses.

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Why Overseed in the Fall?

It's fine to overseed in spring, although many people wait too long and end up seeding in the summer when it's much more difficult to get new grass to grow. However, if you're in the habit of applying a crabgrass prevention herbicide, you can forget about spring seeding. Most pre-emergent herbicides inhibit all seed germination for up to 12 weeks—and that puts you right in the middle of summer. Instead, it's best to overseed right after aerating the lawn, which is ideally done in the fall. 

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