A short YouTube monologue by Nicole Johnsey Burke arguing that USDA-style planting zones (e.g., 9B, 4A) are not useful for vegetable gardeners. She explains zones are based on annual minimum temperatures and are intended for perennial plants; for vegetables the important factors are monthly average high temperatures and whether frost is possible, which determine planting choices (frost-tolerant vs frost-intolerant).
Chapters
Probably going to get a lot of hate from gardeners on this video. But I have to say it. The most useless piece of information for vegetable gardeners is our garden zone. You know that map with all the colors that put you in some number and letter like 9B or 4A? It's made for farmers, not for gardeners. They're based on the lowest temperature that your climate ever experiences during the year. When it comes to vegetable gardening, you don't really need to know the lowest temperature that's ever going to happen in a year. That's made for things like trees and bushes. These vegetable plants, they grow in like 90 days. So what really matters is just two things you need to know. The average high temperature for every month in the garden. And you need to know whether or not there's a chance of frost. If there's a chance of frost, you've got to plant frost tolerant plants. If there's no chance of frost, that's when you plant frost intolerant plants and make sure that the high temperature is not too high for that particular plant you're growing. That number 9B, 4A, 5C. Whatever, doesn't really matter. What matters is the temperature and the frost. Once you figure that out, you'll never need a number again.