I hang mine in a shady, breezy spot outside for several days, maybe a week or two. You want the roots and skins to really dry out before you trim them. After the bulbs get dry , I store mine in a cool dark spot, garage or downstairs, hanging in a mesh bag.
I just planted my chiles and tomatoes, we had our last night time temps in 30's last week I hope. My shallot harvest won't be til July.
Wish I could grow some good sized onions .