Brocket, ND 58321 Frost Dates
Brocket, 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 138 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Brocket 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 Brocket's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/11 isn't a guarantee
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 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.
Brocket against the rest of the dataset
Brocket's growing season runs about 138 days, ranking 37,490 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 208 of 405.
Learn more
Before leaning on 58321's figures: zone vs. frost date explains why Zone 4a and Brocket's frost date answer different questions, while the frost range explains how to read the range around Brocket's dates instead of trusting one.