El Monte, CA 91732 Frost Dates
El Monte, CA: when does the frost end?
Around 01/04 is the usual last spring frost, about 129 days away. Fall's first freeze usually shows up around 01/02, roughly 365 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts El Monte in Zone 10b (35 to 40°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 18 weeks until El Monte's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
01/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/19 and only about 1 year in 10 sees frost after that.
El Monte against the rest of the dataset
About 365 days separate El Monte's last and first frost, putting it 488 of 40,283 ZIP codes nationally. Within CA, it ranks 204 of 2,555.
Learn more
Before leaning on 91732's figures: local microclimates explains what one yard in El Monte can differ from the 91732 normal, while zone vs. frost date explains why Zone 10b and El Monte's frost date answer different questions.