Fairfield, ID 83337 Frost Dates
83337, near Fairfield, ID: the frost window
The last spring frost here typically falls around 06/08, about 284 days from today. Fall's first freeze usually shows up around 09/14, roughly 97 days after the last spring frost.
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 Fairfield, not a forecast for this year.
Stretching the season past the first frost
Fairfield's growing season runs out in roughly 2 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 06/08 isn't a guarantee
06/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/28 and only about 1 year in 10 sees frost after that.
Fairfield against the rest of the dataset
Fairfield's growing season runs about 97 days, ranking 39,785 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 256 of 320.
Learn more
Two guides worth reading on 83337: the frost range, on how to read the range around Fairfield's dates instead of trusting one, and local microclimates, on what one yard in Fairfield can differ from the 83337 normal.