St. John, ND 58369 Frost Dates
When can you plant in St. John, ND?
Typically, the last spring freeze lands around 05/19, roughly 264 days out. The first fall frost typically arrives around 09/24, about 126 frost-free days later.
St. John 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
About 4 weeks of growing season left in St. John before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around St. John's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. John compares
At roughly 126 frost-free days, St. John places 38,720 of 40,283 ZIP codes in this dataset. Within ND, it ranks 358 of 405.
Learn more
zone vs. frost date covers why Zone 3b and St. John's frost date answer different questions. the frost range covers how to read the range around St. John's dates instead of trusting one.