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Plug aeration is more effective than spike aeration, although it mars the appearance of your lawn until the plugs decompose. This can take a few weeks and some homeowners find it distressing, especially if they are planning an event and can't have guests stepping on the soil cores. Liquid aeration is just as effective without having to bore holes.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

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.

Although core aeration is overall a better method of aerating a lawn, spike aeration can still be helpful, especially if you have a smaller yard or are only trying to work on a specific problem area. Because spike aeration is so accessible thanks to its lower cost and easy DIY tools like aerator shoes, it can still be worthwhile for some gardeners.