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First, you should figure out whether you have dormant or dead grass. Dead grass won’t come back, so you’ll have to reseed if you’re hoping for a lush lawn. However, grass can go dormant if it hasn’t received enough water or if temperatures are too cold. If it’s still decently warm outside, you can revive dormant grass by watering it. But if it’s mid-January in New England, for example, you’ll need to wait until the weather warms up again. If you want to keep grass green in winter, consider a grass like Kentucky bluegrass, which maintains its color year-round.

Aerate during the growing season, typically in spring or fall, when grass can quickly recover.

Yes, you can DIY either core or liquid aeration for your lawn. You can use a manual core aerator or rent an automatic one. Just be sure to mark off yard obstacles like sprinkler heads before you start. Liquid aeration is easier—just hook up a garden pump sprayer, although some are able to be attached to a hose. While liquid aeration is not as laborious as core aeration, you will need to focus on an even distribution of the solution across your entire lawn for it to be effective. Of course, if you are unsure about doing both, call a pro.

Many factors can cause your yard to have lawn depressions. Here are the most common reasons: 

• Heavy rainfall 

• Wild animals such as moles, voles, and groundhogs that burrow and tunnel

• Poor drainage

• Buried items such as pipes that break down

• Decaying tree roots or stumps

• Soil that has compacted

• Improper mowing techniques

• Driving heavy equipment and vehicles through the yard