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.
Tall & Fine Fescues are planted from the upper south and Midwest to Northern areas with some tall fescue varieties growing well in parts of the Western USA and California. These year round green grasses, in cool season grass growing areas, are best planted in the fall and spring of each year.