Leith, ND 58529 Frost Dates
58529, near Leith, ND: the frost window
Around 05/19 is the usual last spring frost, about 264 days away. Fall's first freeze usually shows up around 09/25, roughly 127 days after the last spring frost.
Zone 4a (-30 to -25°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 Leith, not a forecast for this year.
Stretching the season past the first frost
Leith's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/19 isn't a guarantee
05/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Leith against the rest of the dataset
At roughly 127 frost-free days, Leith places 38,673 of 40,283 ZIP codes in this dataset. Within ND, it ranks 351 of 405.
Learn more
Two guides worth reading on 58529: zone vs. frost date, on why Zone 4a and Leith's frost date answer different questions, and the frost range, on how to read the range around Leith's dates instead of trusting one.