Boulder City, NV 89005 Frost Dates
89005, near Boulder City, NV: the frost window
Typically, the last spring freeze lands around 01/21, roughly 146 days out. Fall's first freeze usually shows up around 12/17, roughly 328 days after the last spring frost.
Boulder City sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Boulder City'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.
Boulder City against the rest of the dataset
Boulder City's growing season runs about 328 days, ranking 3,186 of 40,283 US ZIP codes measured here, longest to shortest. Within NV, it ranks 48 of 222.
Learn more
Two guides worth reading on 89005: zone vs. frost date, on why Zone 9b and Boulder City's frost date answer different questions, and the frost range, on how to read the range around Boulder City's dates instead of trusting one.