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Does Grass Seed Go Bad? Here's What You Can Do With It
By Ethan Harrison Smith
Most grass seeds tend to go bad after about 5 years, but will deteriorate a little at a time, losing about 10% viability every year. You can still use it, but with some caveats.
You'll need to use a bit extra based on how much it has deteriorated, since many of the seeds won't germinate. If the grass seed has deteriorated by about 20%, then use 20% extra.
In addition to planting old grass seed normally, it can also be used for overseeding, added to compost, for home decor, or even bird seed.
Otherwise, you may simply want to put it in the trash for local trash pickup. In some areas, there are additional options for recycling organic materials such as grass seeds.