Oriska, ND 58063 Frost Dates
Oriska, ND: when does the frost end?
Around 05/13 is the usual last spring frost, about 258 days away. Fall's first freeze usually shows up around 09/26, roughly 136 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Oriska 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 4 weeks until Oriska's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/13 isn't a guarantee
05/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Oriska against the rest of the dataset
About 136 days separate Oriska's last and first frost, putting it 37,805 of 40,283 ZIP codes nationally. Within ND, it ranks 248 of 405.
Learn more
Before leaning on 58063's figures: local microclimates explains what one yard in Oriska can differ from the 58063 normal, while zone vs. frost date explains why Zone 4a and Oriska's frost date answer different questions.