Mid April for me. I don’t like to transplant until the latter part of May. I don’t like cook damp weather. Plus I have stuff that I planted in the previous fall that I use during the rainy spring season.
Like lettuce, carrots, garlic, winter wheat. While I have tried various seeds to start and transplant, tomatoes are the ones that I feel the success was sufficient to reward the effort.
I plant directly for most things. I do plant potatoes in April and early May.