Sentinel Butte, ND 58654 Frost Dates
Sentinel Butte, ND: when does the frost end?
Typically, the last spring freeze lands around 05/16, roughly 261 days out. Fall's first freeze usually shows up around 09/26, roughly 130 days after the last spring frost.
Sentinel Butte 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.
Stretching the season past the first frost
With roughly 4 weeks until Sentinel Butte'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
05/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Sentinel Butte against the rest of the dataset
About 130 days separate Sentinel Butte's last and first frost, putting it 38,429 of 40,283 ZIP codes nationally. Within ND, it ranks 309 of 405.
Learn more
Before leaning on 58654's figures: zone vs. frost date explains why Zone 4a and Sentinel Butte's frost date answer different questions, while the frost range explains how to read the range around Sentinel Butte's dates instead of trusting one.