Are you going to puree them or leave them whole (or halved)? Pureed they would definitely be fine to freeze. My only concern with freezing them with the intent to eat them whole later is that they'd defrost all mushy.
I always have a stash of apples and pears in my freezer. I bake them, pure them, and freeze them in ice cube trays. Once they're frozen I pop them out and put them in ziplock bags, the kind you can suck the air out of. They always taste great! Haven't tried them any other way. I agree with PP, they may get mushy if you try to keep them whole...
Re: roasted apples and pears
Melodic Insomniac