Port Hueneme, CA 93020 Frost Dates
93020, near Port Hueneme, CA: the frost window
Around 12/29 is the usual last spring frost, about 123 days away. Fall's first freeze usually shows up around 12/24, roughly 365 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Port Hueneme in Zone 10a (30 to 35°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
Port Hueneme's growing season runs out in roughly 17 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
12/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/09 and only about 1 year in 10 sees frost after that.
Port Hueneme against the rest of the dataset
At roughly 365 frost-free days, Port Hueneme places 1,214 of 40,283 ZIP codes in this dataset. Within CA, it ranks 532 of 2,555.
Learn more
Two guides worth reading on 93020: zone vs. frost date, on why Zone 10a and Port Hueneme's frost date answer different questions, and the frost range, on how to read the range around Port Hueneme's dates instead of trusting one.