Pesticide products should be protected from temperature extremes while in storage. The pesticide label may specify temperatures that should be avoided when storing the product. However, a typical range to maintain is between 40 and 100 degrees F.
Some pesticides will freeze when they get too cold and the container may crack and leak. Some formulations may separate in freezing temperatures. Be sure to minimize fire hazards if you provide supplemental heating to the storage area.
Some pesticides expand when they get very hot. Plastic containers may melt or become brittle. Also, heat may cause a buildup of pressure that may break glass containers or cause the chemicals to volatilize or spill out when the container is opened. Excessive heat may cause an explosion or fire. Exhaust fans will help reduce temperatures.
Refer to the following web page for more details about storage temperatures for pesticides: Storage Conditions from the Pesticide Environmental Stewardship website.
