Broadview, MT 59015 Frost Dates
When can you plant in Broadview, MT?
Typically, the last spring freeze lands around 05/22, roughly 267 days out. The first fall frost typically arrives around 09/15, about 114 frost-free days later.
Broadview 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 Broadview before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/22 isn't a guarantee
05/22 is the middle of 30 years of NOAA records, not a promise. Plant by 05/11 and you're betting against frost in roughly 9 years out of 10. 06/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Broadview compares
Broadview's growing season runs about 114 days, ranking 39,376 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 252 of 392.
Learn more
zone vs. frost date covers why Zone 4b and Broadview's frost date answer different questions. the frost range covers how to read the range around Broadview's dates instead of trusting one.