Nampa, ID 83687 Frost Dates
Frost dates for Nampa, ID, ZIP 83687
The last spring frost here typically falls around 04/29, about 244 days from today. The first fall frost typically arrives around 10/13, about 164 frost-free days later.
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.
What to do before the first frost
Zone 7a around Nampa has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Nampa's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Nampa compares
Nampa's growing season runs about 164 days, ranking 30,814 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 73 of 320.
Learn more
zone vs. frost date explains why Zone 7a and Nampa's frost date answer different questions, and the frost range explains how to read the range around Nampa's dates instead of trusting one.