Oberon, ND 58357 Frost Dates
Oberon, ND: when does the frost end?
The last spring frost here typically falls around 05/12, about 257 days from today. Fall's first freeze usually shows up around 09/29, roughly 138 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Oberon 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 Oberon'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
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/01 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.
Oberon against the rest of the dataset
Oberon's growing season runs about 138 days, ranking 37,478 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 202 of 405.
Learn more
Before leaning on 58357's figures: zone vs. frost date explains why Zone 4a and Oberon's frost date answer different questions, while the frost range explains how to read the range around Oberon's dates instead of trusting one.