Langdon, ND 58249 Frost Dates
58249, near Langdon, ND: the frost window
Typically, the last spring freeze lands around 05/15, roughly 260 days out. Fall's first freeze usually shows up around 09/22, roughly 128 days after the last spring frost.
Langdon 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.
Stretching the season past the first frost
Langdon's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Langdon against the rest of the dataset
At roughly 128 frost-free days, Langdon places 38,542 of 40,283 ZIP codes in this dataset. Within ND, it ranks 318 of 405.
Learn more
Two guides worth reading on 58249: zone vs. frost date, on why Zone 3b and Langdon's frost date answer different questions, and the frost range, on how to read the range around Langdon's dates instead of trusting one.