Randy writes
It is not recommended to leave any type of chemical in areas where they could freeze or over heat because of the potential for the chemical to break down. According to the manufacturer, as long as the Killzall Weed and Grass Killer was only exposed to sub freezing temperatures for a short period of time and the product looks exactly the same as before it was exposed, it should be fine.
Answer last updated on: 05/12/2011
