Source: The Castaic, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.
Plant fescues when fall temperature reach about 75 F. The next best time to plant fescue seeds is when rising temperatures in spring reach 60 F. Summer isn't a good time to plant fescue lawns, because fescue grass tends to go dormant during periods of high temperature.
Temperature Consideration. Rapid germination relies on proper soil temperatures in the fall or spring. Fescue seeds prefer a soil temperature range between 50 and 65 degrees Fahrenheit. If you do not have a soil thermometer to verify this range, wait until the air temperature is about 60 to 75 degrees Fahrenheit.