How Long Can I Keep Grass Seed In My Shed?

Q: If I buy grass seed now, will the seed be good in October? I would keep it dry and off the floor in a shed. 

A: Grass seed best retains its germination ability when it is stored in a spot that is both dry and cool. Your shed will be dry, but I imagine it will be pretty hot in summer. Grass seed naturally loses around 10% of its germination ability each year. Can you store the seed in your house where it’s cooler? Put it in a tightly sealed container so the seed does not absorb moisture from the air.