St. Maries, ID 83842 Frost Dates
St. Maries, ID: when does the frost end?
The last spring frost here typically falls around 04/22, about 237 days from today. Fall's first freeze usually shows up around 10/18, roughly 179 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 St. Maries, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until St. Maries'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
04/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
St. Maries against the rest of the dataset
St. Maries's growing season runs about 179 days, ranking 25,331 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 41 of 320.
Learn more
Before leaning on 83842's figures: the frost range explains how to read the range around St. Maries's dates instead of trusting one, while local microclimates explains what one yard in St. Maries can differ from the 83842 normal.