Much depends upon what you are planting. Cool weather crops such as lettuce, sweet peas, arugula, even corn, can be planted anywhere for a couple of weeks to a month or more in front of the last frost date. While tender plants such as tomatoes, egg plant, squash, and cucumbers can go into the ground as soon as danger of frost is over, some plants won't really do well until the ground temperature warms to over 60 degrees or warmer. Beans especially seem to dislike cool soil temperatures, so I usually plant them last, giving the soil an extra week or two to warm up. If trying to jump the season with beans, I'll plant several succession plantings, just in case the earliest doesn't do well.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.