how long does frozen fruit last?

While cleaning out my freezer & i found lots of bags of frozen fruit, berries & grapes hiding in the back of my freezer. :noway:
I remember buying them in the late spring early summer. Do you think they are still good to eat?
I am especially worried about the grapes. i never had frozen grapes b4.
i thought i read somewhere on here that they were only good for up 2 weeks.
i'd hate to be wasteful & toss them all out.
what do you think?