Bloomington, ID 83223 Frost Dates
Bloomington, ID: when does the frost end?
Around 06/17 is the usual last spring frost, about 293 days away. Fall's first freeze usually shows up around 09/03, roughly 77 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Bloomington in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 1 week until Bloomington's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 06/17 isn't a guarantee
06/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/04 and only about 1 year in 10 sees frost after that.
Bloomington against the rest of the dataset
At roughly 77 frost-free days, Bloomington places 40,082 of 40,283 ZIP codes in this dataset. Within ID, it ranks 296 of 320.
Learn more
Before leaning on 83223's figures: local microclimates explains what one yard in Bloomington can differ from the 83223 normal, while zone vs. frost date explains why Zone 5a and Bloomington's frost date answer different questions.