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When stored under ideal conditions, grass seed lasts anywhere from 10 to 18 months from the testing date without any real decrease in the germination rate. You can still use the seeds after this timeframe, but the germination rates drop 10% to 20% each year. 

If you’re just embarking on an overseeding project, using seeds that have been in storage for a few years isn’t too big of a deal. However, if you’re planning on redoing your entire landscape, your best bet for a healthy, luscious lawn is to use new seeds.

If thrown on the ground and left, some Bermuda seeds will sprout on the surface, but you will have a diminished germination rate. It’s best to cultivate the area before spreading the seeds for optimal results. Rake the area first and then evenly distribute the Bermuda seeds. Cover the space with about ¼ inch of soil before watering the area.

In the fall, you should aerate the soil, overseed the bare spots, kill weeds, mow the lawn low, and rake your leaves. By boosting your lawn’s health in the fall, your grass will be stronger throughout the winter and come back healthier in the spring. You should also trim your perennials so that they withstand the winter and are ready for new growth in the spring. 

Those who live in between zones may have summers too warm for many cool-season grasses and winters too cold for warm-season grasses. Grasses selected for these climates must be well adapted to both conditions, so opt for tall fescue if your area is more prone to very cold temperatures or kikuyu grass if your home has notably hot summers.