For my region usually the first frost comes the 20th of October, and I was wondering, how can I tell when the frost is coming exactly? Like is the first frost the first day the temperature goes below freezing? Or is it the first day that the temperature comes close to freezing? Also, if my plants aren't fully developed by then should I go ahead and harvest them before the frost, or wait till they are fully developed even if that means they're exposed to the frost? Thanks so much