I transplanted my onions to the garden in two batches.
I grew from seed and trimmed them the way several suggested.
First batch went under row cover in mid March and survived a snowstorm and many nights in the 20s. Second batch went in about a week ago.
First batch seems to have lost most living leaf tissue, but some have new growth starting to pop.
That is a new leaf starting. About half have this, half don’t so far, but none per se look dead.