Winchester, ID 83555 Frost Dates
83555, near Winchester, ID: the frost window
The last spring frost here typically falls around 05/23, about 268 days from today. Fall's first freeze usually shows up around 09/25, roughly 121 days after the last spring frost.
Winchester sits in USDA Zone 6b (-5 to 0°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
Winchester's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/19 and only about 1 year in 10 sees frost after that.
Winchester against the rest of the dataset
At roughly 121 frost-free days, Winchester places 39,041 of 40,283 ZIP codes in this dataset. Within ID, it ranks 212 of 320.
Learn more
Two guides worth reading on 83555: the frost range, on how to read the range around Winchester's dates instead of trusting one, and local microclimates, on what one yard in Winchester can differ from the 83555 normal.