Pierce, ID 83546 Frost Dates
83546, near Pierce, ID: the frost window
Around 06/03 is the usual last spring frost, about 279 days away. Fall's first freeze usually shows up around 09/07, roughly 93 days after the last spring frost.
Pierce sits in USDA Zone 6a (-10 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.
Stretching the season past the first frost
Pierce's growing season runs out in roughly 1 week — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Pierce's last frost
06/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/29 and only about 1 year in 10 sees frost after that.
Pierce against the rest of the dataset
At roughly 93 frost-free days, Pierce places 39,876 of 40,283 ZIP codes in this dataset. Within ID, it ranks 264 of 320.
Learn more
Two guides worth reading on 83546: zone vs. frost date, on why Zone 6a and Pierce's frost date answer different questions, and the frost range, on how to read the range around Pierce's dates instead of trusting one.