Boise City, ID 83709 Frost Dates
When can you plant in Boise City, ID?
The last spring frost here typically falls around 04/24, about 239 days from today. The first fall frost typically arrives around 10/21, about 179 frost-free days later.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Boise City, not a forecast for this year.
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 25,136 of 40,283 ZIP codes in this dataset. Within ID, it ranks 15 of 320.
Learn more
zone vs. frost date covers why Zone 7a and Boise City's frost date answer different questions. the frost range covers how to read the range around Boise City's dates instead of trusting one.