Title says it all.

bump.

I would assume yes. I still see items that I have dropped, or put somewhere from the begining of the game. I aslo use the secret room in Riften to store everyhting I have. I do not own a house.

However, keep in mind that in order to get into the castle you must be a vampire. If you change to a werewolf, you'll have to change back. Which is easy, unless you want to keep being a werewolf. All you have to do is talk to Serana.

i think u were thinking of the vampire's castle

Oh, you are correct. My fault.

I do not know about Dawnguard, sorry.

ok so i just tested it and as a whole, fort dawnguard is not safe for storage. havent checked every container though.