Boise City, ID 83701 Frost Dates
When can you plant in Boise City, ID?
Around 04/24 is the usual last spring frost, about 239 days away. The first fall frost typically arrives around 10/21, about 179 frost-free days later.
Boise City 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
About 8 weeks of growing season left in Boise City before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Boise City's last frost
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Boise City compares
At roughly 179 frost-free days, Boise City places 25,132 of 40,283 ZIP codes in this dataset. Within ID, it ranks 11 of 320.
Learn more
local microclimates covers what one yard in Boise City can differ from the 83701 normal. zone vs. frost date covers why Zone 7a and Boise City's frost date answer different questions.