To improve your chances of ideal growing conditions in this unpredictable time of year, sow each crop in a couple batches, staggered about a week apart.
Cool-season crops should be planted in the garden now. Cool-season vegetables grow best at temperatures averaging 15° cooler than those needed by warm season varieties and need to mature in cool weather.
Asparagus*
Artichoke
Beet
Bok Choy
Broccoli*
Brussel Sprount*
Cabbage*
Carrot
Cauliflower
Celery
Chard
Chinese cabbage
Collard*
Fennel
Herbs - Cilantro, Dill, Lavender, Mint, Parsley, Rosemary, Sage, Thyme
Kale
Endive
Leek
Lettuce
Onion*
Peas
Potato
Radish*
Rutabaga
Shallot*
Spinach*
Turnip*
*Not affected by frost and can be planted directly in the garden in cooler climates.
Start summer garden annual flower and vegetable seeds - under lights if your zone is still too cold.
Bean - Lima, Snap
Cantaloupe
Corn
Cucumber
Eggplant
Gourd
Melon
Okra
Peppers
Pumpkin
Snow Pea
Summer squash
Sweet potato
Tomato
Watermelon
Please note, this list is a starting point. Check your plant hardiness zone to ensure you are planting seedlings and transplants at the correct time for your zone.
Checkout Rodale's Seed Starting Chart to give you a good idea as to when you can plant what seed for your specific weather.