House floors are ideal for storing onions.
Onions absolutely need dry air, if they are to last until the spring onion harvest. This condition is generally met on the house floor. You spread the onions in a thin layer either directly on the ground or put them in flat boxes and place them on top of each other several times.
Although onions tolerate a lot of cold, In severe frost, covering with several layers of newspaper is recommended. Onions should not be touched when frozen, because this easily causes rotten spots to form after thawing.