Winnett, MT 59084 Frost Dates
When can you plant in Winnett, MT?
Around 05/18 is the usual last spring frost, about 263 days away. The first fall frost typically arrives around 09/21, about 124 frost-free days later.
Winnett sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 3 weeks of growing season left in Winnett before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Winnett's last frost
05/18 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Winnett compares
About 124 days separate Winnett's last and first frost, putting it 38,870 of 40,283 ZIP codes nationally. Within MT, it ranks 191 of 392.
Learn more
local microclimates covers what one yard in Winnett can differ from the 59084 normal. zone vs. frost date covers why Zone 4b and Winnett's frost date answer different questions.