Derby Line, VT 05830 Frost Dates
Derby Line, VT: when does the frost end?
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.
Derby Line 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 5 weeks until Derby Line's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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 05/28 and only about 1 year in 10 sees frost after that.
Derby Line against the rest of the dataset
About 138 days separate Derby Line's last and first frost, putting it 37,436 of 40,283 ZIP codes nationally. Within VT, it ranks 194 of 330.
Learn more
Before leaning on 05830's figures: the frost range explains how to read the range around Derby Line's dates instead of trusting one, while local microclimates explains what one yard in Derby Line can differ from the 05830 normal.