Answer: You are in USDA gardening zone 5A with an average last frost day of April 15 and a first frost date of about November 15. The plants you've chosen are considered cool-season plants and can go into the ground about the first of April. If you plant them then and a cold snap threatens, you can temporarily cover your plants with a floating row cover to protect them from frost. If you're sowing seeds, you can do it now - the seeds are cold tolerant and will wait to sprout after the weather warms a bit. If you're setting out transplants, keep them in a protected area for another 2 weeks, then plant them out in the garden.
Hope this answers all your questions!
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