Ponderay, ID 83821 Frost Dates
Ponderay, ID: when does the frost end?
The last spring frost here typically falls around 05/20, about 265 days from today. Fall's first freeze usually shows up around 09/13, roughly 114 days after the last spring frost.
Ponderay sits in USDA Zone 6a (-10 to -5°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
With roughly 2 weeks until Ponderay's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/20 isn't a guarantee
05/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/04 and only about 1 year in 10 sees frost after that.
Ponderay against the rest of the dataset
Ponderay's growing season runs about 114 days, ranking 39,359 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 232 of 320.
Learn more
Before leaning on 83821's figures: zone vs. frost date explains why Zone 6a and Ponderay's frost date answer different questions, while the frost range explains how to read the range around Ponderay's dates instead of trusting one.