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.
If you plan to establish or renovate your lawn with a cool season grass this fall be sure to seed before the end of September for best results. The following tips and advice for sowing tall fescue are adapted from this Turf Alert, posted Sep 15, 2014 by Grady Miller on NCSU TurfFiles. Tips For Success: Seeding Cool Season Turfgrasses. Fall is the best time for renovation and seeding of tall fescue and other cool-season lawns.