Lincoln, ND 58504 Frost Dates
58504, near Lincoln, ND: the frost window
Typically, the last spring freeze lands around 05/14, roughly 259 days out. Fall's first freeze usually shows up around 09/30, roughly 138 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Lincoln 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
Lincoln's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/14 isn't a guarantee
05/14 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 05/27 and only about 1 year in 10 sees frost after that.
Lincoln against the rest of the dataset
Lincoln's growing season runs about 138 days, ranking 37,382 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 184 of 405.
Learn more
Two guides worth reading on 58504: zone vs. frost date, on why Zone 4a and Lincoln's frost date answer different questions, and the frost range, on how to read the range around Lincoln's dates instead of trusting one.