Buchanan, ND 58420 Frost Dates
Buchanan, ND: when does the frost end?
Around 05/11 is the usual last spring frost, about 256 days away. Fall's first freeze usually shows up around 09/28, roughly 139 days after the last spring frost.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Buchanan, not a forecast for this year.
Stretching the season past the first frost
With roughly 4 weeks until Buchanan'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
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 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.
Buchanan against the rest of the dataset
At roughly 139 frost-free days, Buchanan places 37,306 of 40,283 ZIP codes in this dataset. Within ND, it ranks 162 of 405.
Learn more
Before leaning on 58420's figures: local microclimates explains what one yard in Buchanan can differ from the 58420 normal, while zone vs. frost date explains why Zone 4b and Buchanan's frost date answer different questions.