A person carefully inspecting a handful of grass seeds
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How To Tell If Your Grass Seed Is Too Old To Plant
Grass seeds can go bad and lose their ability to germinate over time due to factors like storage temperature, sunlight exposure, and moisture levels.
The seed germination rates typically decline about 10% each year they're kept in storage, although this rate can vary depending on the species of grass.
To determine if your seeds are still good, open the container and inspect the seeds closely. Make sure they don’t have a funky odor or look wet or moldy.
If they seem fine, place ten seeds on a damp paper towel in a warm area for ten days. If fewer than five seeds sprout, your seeds likely have less than 50% efficacy.