Per Micheal Artindale:
Is it bad to store a composite kayak outdoors for the winter?

I would have it all closed up so no animals get in.

I have not decided if I will wrap it in plastic of some sort.

I guess there's "winter" and then there's "WINTER"....

Here in the near-tropics of SouthEastern Penna, I've been storing
my kayaks outside 24-7-365 with no problems.

I did have a spec surf ski where the (cosmetic?) fiberglass tape
started separating from the seam it was covering after about five
years; but my money is on poor surface prep, bad resin, or
something like that.... because that was the only problem craft
out of at least a half-dozen boats.
--
PeteCresswell