It can be cold here, even below 0 F, and we can get snow. And our nights are long and it's cloudy or foggy for days at a time. But our grass, wild plants, and even the conifers are active (more or less) anytime temperatures are above 40 F. Some plants, like the wild carrots, dandelions, wild field mustard, watercress, and other wild mustards, do pretty well in our wet winters. It's not as productive as spring, but there's always something to eat! :D