Mother Earth News
just published a useful collection of climate information, freeze/frost dates and regional planting guides. Author Tabitha Alerman says:
Knowing when to plant, water, weed, fertilize, mulch and harvest can get pretty overwhelming when the season’s in full swing, so here are a few resources to help with garden planning. Now, go out and grow your best garden ever!
Particularly helpful is the "What to plant now
" information. Choose your region and plan by month. Oh, we're getting organized now!