Hobson, MT 59462 Frost Dates
When can you plant in Hobson, MT?
The last spring frost here typically falls around 05/28, about 273 days from today. The first fall frost typically arrives around 09/20, about 112 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hobson in Zone 4b (-25 to -20°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 Hobson before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Hobson's last frost
05/28 is the middle of 30 years of NOAA records, not a promise. Plant by 05/13 and you're betting against frost in roughly 9 years out of 10. 06/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hobson compares
About 112 days separate Hobson's last and first frost, putting it 39,446 of 40,283 ZIP codes nationally. Within MT, it ranks 266 of 392.
Learn more
local microclimates covers what one yard in Hobson can differ from the 59462 normal. zone vs. frost date covers why Zone 4b and Hobson's frost date answer different questions.