Henderson, NV 89150 Frost Dates
89150, near Henderson, NV: the frost window
Around 01/21 is the usual last spring frost, about 146 days away. Fall's first freeze usually shows up around 12/17, roughly 328 days after the last spring frost.
Zone 9a (20 to 25°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.
Why 01/21 isn't a guarantee
01/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/29 and only about 1 year in 10 sees frost after that.
Henderson against the rest of the dataset
Henderson's growing season runs about 328 days, ranking 3,154 of 40,283 US ZIP codes measured here, longest to shortest. Within NV, it ranks 30 of 222.
Learn more
Two guides worth reading on 89150: zone vs. frost date, on why Zone 9a 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.