St. Maries, ID 83830 Frost Dates
When can you plant in St. Maries, ID?
The last spring frost here typically falls around 05/15, about 260 days from today. The first fall frost typically arrives around 09/21, about 126 frost-free days later.
The USDA Plant Hardiness Zone Map puts St. Maries in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 3 weeks of growing season left in St. Maries before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 06/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Maries compares
About 126 days separate St. Maries's last and first frost, putting it 38,686 of 40,283 ZIP codes nationally. Within ID, it ranks 187 of 320.
Learn more
the frost range covers how to read the range around St. Maries's dates instead of trusting one. local microclimates covers what one yard in St. Maries can differ from the 83830 normal.