I agree with Ranchugirl that about 6 months is best, although they would be ok longer.
Since I like to eat frozen peas myself, I don't have to worry about them being in the freezer too long.
But I realize that not everyone likes peas.
I buy the unsalted petite peas. After they are popped out of their skins, they are the perfect size for my fish to eat. And they love peas.