Here’s a summary of which crops to plant early, and which ones not to plant until after your last spring frost date:
Very early spring (as soon as the ground can be worked)

Onions
peas
spinach

Early spring

lettuce
beets
carrots
radishes
dill
cilantro
cabbage
broccoli
celery
kale
potatoes

After last frost date

beans
corn
melons
cucumbers
squash
tomatoes
peppers
pumpkins
eggplant
basil

Read more: http://www.motherearthnews.com/Organic-Gardening/How-to-Find-Average-Last-Spring-Frost-Date.aspx?page=2#ixzz1ocbPCoiE