Derby Line, VT 05902 Frost Dates
05902, near Derby Line, VT: the frost window
Typically, the last spring freeze lands around 05/25, roughly 270 days out. Fall's first freeze usually shows up around 09/22, roughly 120 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
Derby Line'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.
The actual range around Derby Line's last frost
05/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/08 and only about 1 year in 10 sees frost after that.
Derby Line against the rest of the dataset
About 120 days separate Derby Line's last and first frost, putting it 39,089 of 40,283 ZIP codes nationally. Within VT, it ranks 308 of 330.
Learn more
Two guides worth reading on 05902: local microclimates, on what one yard in Derby Line can differ from the 05902 normal, and zone vs. frost date, on why Zone 4a and Derby Line's frost date answer different questions.