Perth, ND 58363 Frost Dates
Frost dates for Perth, ND, ZIP 58363
Around 05/20 is the usual last spring frost, about 265 days away. The first fall frost typically arrives around 09/26, about 128 frost-free days later.
Perth sits in USDA Zone 3b (-35 to -30°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
Zone 3b around Perth 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 Perth's last frost
05/20 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 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 Perth compares
Perth's growing season runs about 128 days, ranking 38,602 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 336 of 405.
Learn more
zone vs. frost date explains why Zone 3b and Perth's frost date answer different questions, and the frost range explains how to read the range around Perth's dates instead of trusting one.