Mullan, ID 83874 Frost Dates
When can you plant in Mullan, ID?
Around 05/31 is the usual last spring frost, about 276 days away. The first fall frost typically arrives around 09/05, about 95 frost-free days later.
Zone 6a (-10 to -5°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 Mullan, not a forecast for this year.
What to do before the first frost
About 1 week of growing season left in Mullan 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
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/16 and you're betting against frost in roughly 9 years out of 10. 06/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mullan compares
About 95 days separate Mullan's last and first frost, putting it 39,813 of 40,283 ZIP codes nationally. Within ID, it ranks 259 of 320.
Learn more
the frost range covers how to read the range around Mullan's dates instead of trusting one. local microclimates covers what one yard in Mullan can differ from the 83874 normal.