Nampa, ID 83686 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.
The USDA Plant Hardiness Zone Map puts Nampa in Zone 7a (0 to 5°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 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
Nampa's growing season runs about 164 days, ranking 30,813 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 72 of 320.
Learn more
Before leaning on 83686's figures: local microclimates explains what one yard in Nampa can differ from the 83686 normal, while zone vs. frost date explains why Zone 7a and Nampa's frost date answer different questions.