Cascade, ID 83611 Frost Dates
When can you plant in Cascade, ID?
Around 05/30 is the usual last spring frost, about 275 days away. The first fall frost typically arrives around 09/19, about 110 frost-free days later.
Cascade sits in USDA Zone 5a (-20 to -15°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 3 weeks of growing season left in Cascade before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/30 is the middle of 30 years of NOAA records, not a promise. Plant by 05/10 and you're betting against frost in roughly 9 years out of 10. 06/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cascade compares
At roughly 110 frost-free days, Cascade places 39,506 of 40,283 ZIP codes in this dataset. Within ID, it ranks 238 of 320.
Learn more
zone vs. frost date covers why Zone 5a and Cascade's frost date answer different questions. the frost range covers how to read the range around Cascade's dates instead of trusting one.