Calimesa, CA 92320 Frost Dates
Calimesa, CA: when does the frost end?
Typically, the last spring freeze lands around 01/27, roughly 152 days out. Fall's first freeze usually shows up around 12/19, roughly 329 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Calimesa in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 16 weeks until Calimesa's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/27 isn't a guarantee
01/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/21 and only about 1 year in 10 sees frost after that.
Calimesa against the rest of the dataset
About 329 days separate Calimesa's last and first frost, putting it 3,096 of 40,283 ZIP codes nationally. Within CA, it ranks 1,348 of 2,555.
Learn more
Before leaning on 92320's figures: zone vs. frost date explains why Zone 9b and Calimesa's frost date answer different questions, while the frost range explains how to read the range around Calimesa's dates instead of trusting one.