Henderson, NV 89121 Frost Dates
89121, near Henderson, NV: the frost window
Typically, the last spring freeze lands around 01/20, roughly 145 days out. Fall's first freeze usually shows up around 12/15, roughly 333 days after the last spring frost.
Zone 9b (25 to 30°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 Henderson, not a forecast for this year.
Stretching the season past the first frost
Henderson's growing season runs out in roughly 16 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 Henderson's last frost
01/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/20 and only about 1 year in 10 sees frost after that.
Henderson against the rest of the dataset
At roughly 333 frost-free days, Henderson places 2,811 of 40,283 ZIP codes in this dataset. Within NV, it ranks 9 of 222.
Learn more
Two guides worth reading on 89121: zone vs. frost date, on why Zone 9b and Henderson's frost date answer different questions, and the frost range, on how to read the range around Henderson's dates instead of trusting one.