Glenns Ferry, ID 83623 Frost Dates
Glenns Ferry, ID: when does the frost end?
The last spring frost here typically falls around 05/01, about 246 days from today. Fall's first freeze usually shows up around 10/03, roughly 154 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Glenns Ferry in Zone 7a (0 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 Glenns Ferry's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Glenns Ferry's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Glenns Ferry against the rest of the dataset
At roughly 154 frost-free days, Glenns Ferry places 34,358 of 40,283 ZIP codes in this dataset. Within ID, it ranks 100 of 320.
Learn more
Before leaning on 83623's figures: zone vs. frost date explains why Zone 7a and Glenns Ferry's frost date answer different questions, while the frost range explains how to read the range around Glenns Ferry's dates instead of trusting one.