Heyburn, ID 83336 Frost Dates
Heyburn, ID: when does the frost end?
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/04, roughly 150 days after the last spring frost.
Zone 6b (-5 to 0°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 Heyburn, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Heyburn's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Heyburn against the rest of the dataset
At roughly 150 frost-free days, Heyburn places 35,292 of 40,283 ZIP codes in this dataset. Within ID, it ranks 111 of 320.
Learn more
Before leaning on 83336's figures: the frost range explains how to read the range around Heyburn's dates instead of trusting one, while local microclimates explains what one yard in Heyburn can differ from the 83336 normal.