Declo, ID 83323 Frost Dates
Declo, ID: when does the frost end?
Typically, the last spring freeze lands around 05/16, roughly 261 days out. Fall's first freeze usually shows up around 10/01, roughly 136 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Declo in Zone 6a (-10 to -5°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 5 weeks until Declo's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/16 isn't a guarantee
05/16 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 06/05 and only about 1 year in 10 sees frost after that.
Declo against the rest of the dataset
Declo's growing season runs about 136 days, ranking 37,783 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 157 of 320.
Learn more
Before leaning on 83323's figures: zone vs. frost date explains why Zone 6a and Declo's frost date answer different questions, while the frost range explains how to read the range around Declo's dates instead of trusting one.