how long does grass seed last?
Cool Storage Temperature. Keeping your grass seed in a cool storage area is the best way to retain viability. Preferably, the storage area should have no windows so there is no direct sunlight penetration. If you maintain a consistently cool storage area, grass seed may last for 2 to 3 years. However, you will see a drop in germination rates over time since some weakened seeds will not sprout even if they were stored under the best conditions.