We might say that Echinacea is hardy to Zone 3, but that only reveals that Echinacea is likely to survive over winter in Zones 3 and up. Hardiness zones are established by measuring how cold and extreme the average winter gets in a given area, and whether specific perennial plants might survive over winter there. ![]() Hardiness zones also have to do with cold weather, but are quite a separate concept. They also don’t account for our changing climate. They are intended to offer general guidance for garden planning, but they do not account for exceptional weather year over year. ![]() These dates vary widely by region, which makes the regional charts helpful - we hope. Last frost: The last time frost occurs in winter or spring in an average year.įirst and last frost dates are recorded by government-run weather stations all over North America, and the average is based on a fifty-year history for each region. It’s a bit tricky, and it’s all about averages.įirst frost: The first time frost occurs in the autumn in an average year. To create these charts, we look at clusters of the most common average frost dates for a given area and estimate how many weeks make sense to plant seeds before or after the last frost. It takes a lot of work to perfect the planting charts included here.
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