Mission Viejo, CA 92694 Frost Dates
When can you plant in Mission Viejo, CA?
Typically, the last spring freeze lands around 01/06, roughly 131 days out. The first fall frost typically arrives around 01/02, about 365 frost-free days later.
Zone 10b (35 to 40°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Mission Viejo, not a forecast for this year.
What to do before the first frost
About 18 weeks of growing season left in Mission Viejo before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 01/06 isn't a guarantee
01/06 is the middle of 30 years of NOAA records, not a promise. Plant by 02/11 and you're betting against frost in roughly 9 years out of 10. 12/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mission Viejo compares
About 365 days separate Mission Viejo's last and first frost, putting it 570 of 40,283 ZIP codes nationally. Within CA, it ranks 247 of 2,555.
Learn more
local microclimates covers what one yard in Mission Viejo can differ from the 92694 normal. zone vs. frost date covers why Zone 10b and Mission Viejo's frost date answer different questions.