Vegetable gardening

There are generally publications for each state in the US that will tell you when is the best time to plant different vegetables. Not necessarily the exact variety of each to buy but in general such as "leeks" but not "King Richard" leek.

For a general search, you type Google and just replace the state name which which ever you desire

"vegetable gardening in", "state name", site:edu, filtetype:pdf

These publications come from the US Extension Service Offices and are always sponsored by state colleges, hence the EDU to make sure they are actually from the college and not from an individual which can contain viruses. The filetype is so it gets only those published as PDF files. That can be left off for a broader general search.