When temperatures overnight in the spring are 28°F and lower that is considered a freeze. I will cover and deeply water, my cool season annuals like snapdragons, pansies and ranunculus. You can also cover your cool season vegetables if you want to. Definitely deeply water all of them. Use a very light material like a frost cloth or a bedsheet and secure it so the wind doesn’t blow it off overnight. I am a Garden Coach located in the northwest suburbs of Chicago. I do on-site sessions right in yo