The cooler season vegetables like cabbage, broccoli, cauliflower, Brussels sprouts, kohlrabi, beets, turnips, radishes, potatoes, parsnips, lettuce, parsley, spinach, chard, mustard greens, collards, endive, onions, garlic, peas, beans, asparagus, artichoke, Jerusalem artichoke, horseradish and rhubarb can be planted now if they are protected at night because the last frost date is March 15.
60 days later when the veggies are starting to mature for harvest the weather is heating up and the produce won't be top quality. Just imagine, all your Northerners, produce from your garden as early as May 15.
I don't raise vegetables here, though, I try to raise them in Colorado. Here's my last year's garden planted on May 20: hanging tomato, zucchini I started indoors and that barrel planter has potatoes.

I'd like to tell you I had bountiful harvests, but I didn't. Maybe this year.
I'm praying for spring. We're have another snow storm right now, with snow, sleet. May last into tomorrow. Hoping it's the last one. Enough already!