Hi Youngfye ! We are almost neighbors ! Yes, this forum is wonderful , you will meet lots of nice gardener here ! I am in southern Maryland , I've only been gardening in Maryland for about 4 years so I will just tell you my experience here in somd and I will let the experts here give you the best advice however I will tell you that I planted my cool season veggies about 6 weeks ago , everything is growing pretty good except the lettuce is growing a bit slow ( I should have started them inside sooner ) ... Its a few weeks yet before our average last frost date here in somd ... April 30 ... depending on what part of MD you are in I believe you could go ahead and plant some things out, I would hold off on the tomatoes and peppers, they like warm soil and will just sit there if its too cool ... I am thinking about planting out my squash soon in order to get a head start before the squash bugs show up . Its always a guessing game to decide when its too early to plant out ... here is a link to the Maryland Coop Extension Office , I use the planting dates as a guideline , there is a 1 800 number , they can probably help if you want to give them a call .
Hope this helps a little bit !

Iris

Here is a link that might be useful: Maryland Cooperative Extension Office