Onaway, ID 83855 Frost Dates
Onaway, ID: when does the frost end?
Around 05/15 is the usual last spring frost, about 260 days away. Fall's first freeze usually shows up around 09/21, roughly 126 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Onaway in Zone 6b (-5 to 0°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 3 weeks until Onaway's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Onaway's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/02 and only about 1 year in 10 sees frost after that.
Onaway against the rest of the dataset
Onaway's growing season runs about 126 days, ranking 38,722 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 194 of 320.
Learn more
Before leaning on 83855's figures: zone vs. frost date explains why Zone 6b and Onaway's frost date answer different questions, while the frost range explains how to read the range around Onaway's dates instead of trusting one.