Nampa, ID 83651 Frost Dates
Nampa, ID: when does the frost end?
Typically, the last spring freeze lands around 04/29, roughly 244 days out. Fall's first freeze usually shows up around 10/13, roughly 164 days after the last spring frost.
Nampa sits in USDA Zone 7a (0 to 5°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
With roughly 7 weeks until Nampa's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Nampa's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Nampa against the rest of the dataset
At roughly 164 frost-free days, Nampa places 30,812 of 40,283 ZIP codes in this dataset. Within ID, it ranks 71 of 320.
Learn more
Before leaning on 83651's figures: the frost range explains how to read the range around Nampa's dates instead of trusting one, while local microclimates explains what one yard in Nampa can differ from the 83651 normal.