Wibaux, MT 59353 Frost Dates
When can you plant in Wibaux, MT?
Typically, the last spring freeze lands around 05/27, roughly 272 days out. The first fall frost typically arrives around 09/16, about 112 frost-free days later.
The USDA Plant Hardiness Zone Map puts Wibaux in Zone 4a (-30 to -25°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 Wibaux 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
05/27 is the middle of 30 years of NOAA records, not a promise. Plant by 05/15 and you're betting against frost in roughly 9 years out of 10. 06/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Wibaux compares
About 112 days separate Wibaux's last and first frost, putting it 39,432 of 40,283 ZIP codes nationally. Within MT, it ranks 264 of 392.
Learn more
zone vs. frost date covers why Zone 4a and Wibaux's frost date answer different questions. the frost range covers how to read the range around Wibaux's dates instead of trusting one.