Fairview, MT 58838 Frost Dates
Frost dates for Fairview, MT, ZIP 58838
Around 05/11 is the usual last spring frost, about 256 days away. The first fall frost typically arrives around 09/27, about 137 frost-free days later.
Zone 4a (-30 to -25°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 Fairview, not a forecast for this year.
What to do before the first frost
Zone 4a around Fairview has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Fairview's last frost
05/11 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. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fairview compares
About 137 days separate Fairview's last and first frost, putting it 37,539 of 40,283 ZIP codes nationally. Within MT, it ranks 77 of 392.
Learn more
local microclimates explains what one yard in Fairview can differ from the 58838 normal, and zone vs. frost date explains why Zone 4a and Fairview's frost date answer different questions.