Depends on how well they are packaged in my opinion. If they aren't freezer burnt and look pretty good, I will save them up to 1-1.5 years. On the other hand if they don't look so good, 6 months might be all I'll let pass. It just depends. I'll feed freezer burnt if I have to, but I honestly try to avoid it. Also, I will refreeze a feeder if it hasn't been thawed out too long. If it has, in the trash it goes or it is fed to another snake.