Las Vegas, NV 89191 Frost Dates
Las Vegas, NV: when does the frost end?
Around 03/22 is the usual last spring frost, about 206 days away. Fall's first freeze usually shows up around 11/07, roughly 229 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Las Vegas in Zone 9a (20 to 25°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 10 weeks until Las Vegas's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/22 isn't a guarantee
03/22 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 04/13 and only about 1 year in 10 sees frost after that.
Las Vegas against the rest of the dataset
Las Vegas's growing season runs about 229 days, ranking 10,495 of 40,283 US ZIP codes measured here, longest to shortest. Within NV, it ranks 118 of 222.
Learn more
Before leaning on 89191's figures: the frost range explains how to read the range around Las Vegas's dates instead of trusting one, while local microclimates explains what one yard in Las Vegas can differ from the 89191 normal.