Lewisville, ID 83431 Frost Dates
When can you plant in Lewisville, ID?
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 10/05, about 148 frost-free days later.
Zone 5a (-20 to -15°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 Lewisville, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Lewisville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Lewisville's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lewisville compares
Lewisville's growing season runs about 148 days, ranking 35,785 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 128 of 320.
Learn more
local microclimates covers what one yard in Lewisville can differ from the 83431 normal. zone vs. frost date covers why Zone 5a and Lewisville's frost date answer different questions.