Zones refer to the average cold temperature in the winter. A better method of deciding what to grow and when to plant is average last and first frost dates. What's your average first frost date?

I've had frost the first week of September (unusual) and not until the last week of October (also not usual). Average frost date is probably around October 1.
Susan

I'm going to try some faster maturity beans, soybeans and blackeyed peas. I heard it's suppose to add more nutients to the ground for the next year.

Our first frost date in Minneapolis is September 15. I just did research and posted lots of great sources including a planting schedule for zones 3-4 on my blog A Minneapolis Homestead below.

Here is a link that might be useful: A Minneapolis Homestead

I harvested a bucket full of carrots yesterday that I planted after early potatoes here in Maine. They are sweet.