Kathryn, ND 58049 Frost Dates
Kathryn, ND: when does the frost end?
Typically, the last spring freeze lands around 05/03, roughly 248 days out. Fall's first freeze usually shows up around 10/05, roughly 155 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Kathryn 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 5 weeks until Kathryn's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Kathryn against the rest of the dataset
At roughly 155 frost-free days, Kathryn places 34,190 of 40,283 ZIP codes in this dataset. Within ND, it ranks 23 of 405.
Learn more
Before leaning on 58049's figures: local microclimates explains what one yard in Kathryn can differ from the 58049 normal, while zone vs. frost date explains why Zone 4a and Kathryn's frost date answer different questions.