Mission Viejo, CA 92691 Frost Dates
92691, near Mission Viejo, CA: the frost window
Typically, the last spring freeze lands around 01/06, roughly 131 days out. Fall's first freeze usually shows up around 01/02, roughly 365 days after the last spring frost.
Mission Viejo sits in USDA Zone 10b (35 to 40°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Mission Viejo's growing season runs out in roughly 18 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Mission Viejo's last frost
01/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/13 and only about 1 year in 10 sees frost after that.
Mission Viejo against the rest of the dataset
At roughly 365 frost-free days, Mission Viejo places 568 of 40,283 ZIP codes in this dataset. Within CA, it ranks 245 of 2,555.
Learn more
Two guides worth reading on 92691: the frost range, on how to read the range around Mission Viejo's dates instead of trusting one, and local microclimates, on what one yard in Mission Viejo can differ from the 92691 normal.