What is "heavy frost"?
April 9, 2020 11:23 AM Subscribe
I think I understand about the "last frost" date and how to look that up, but I have a bunch of plants that say they can go outside, or that their seeds should be sown outside, or that they need to be pruned, "in early spring after the danger of heavy frost has passed." How am I supposed to know when that is? Is it now? Last year I waited until the "last frost" date for everything and it felt too late: mid-May was practically summer. This is in Madison, WI/zone 5a if anyone has a specific date in mind, but I'm also wondering in general what the concept means.