Most grass seeds will last about two years if stored at room temperature, according to NC State University College of Agriculture & Life Sciences. So, last year's seed should still be good. The germination rate may be lower. Orchardgrass and tall fescue seed only lasts one year.
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Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for About.com, Examiner.com, eHow, and assorted gardening blogs.