how long does grass seed stay good for
Answer by ebu (14). Grass seed will stay good for at least a year and a half to two years, depending on the storage conditions (cool and dry).It will probably stay viable for longer-the only issue is that the germination rate will not be as high as with fresh seed.add a comment.+1 vote!nswer by ebu (14). Grass seed will stay good for at least a year and a half to two years, depending on the storage conditions (cool and dry).