Turtle Lake, ND 58575 Frost Dates
Frost dates for Turtle Lake, ND, ZIP 58575
Around 05/14 is the usual last spring frost, about 259 days away. The first fall frost typically arrives around 09/26, about 136 frost-free days later.
Turtle Lake sits in USDA Zone 4a (-30 to -25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 4a around Turtle Lake has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Turtle Lake compares
About 136 days separate Turtle Lake's last and first frost, putting it 37,762 of 40,283 ZIP codes nationally. Within ND, it ranks 234 of 405.
Learn more
the frost range explains how to read the range around Turtle Lake's dates instead of trusting one, and local microclimates explains what one yard in Turtle Lake can differ from the 58575 normal.