Grandin, ND 58038 Frost Dates
Grandin, ND: when does the frost end?
Typically, the last spring freeze lands around 05/02, roughly 247 days out. Fall's first freeze usually shows up around 10/09, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Grandin in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 6 weeks until Grandin's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Grandin against the rest of the dataset
At roughly 158 frost-free days, Grandin places 33,150 of 40,283 ZIP codes in this dataset. Within ND, it ranks 5 of 405.
Learn more
Before leaning on 58038's figures: zone vs. frost date explains why Zone 4a and Grandin's frost date answer different questions, while the frost range explains how to read the range around Grandin's dates instead of trusting one.