Derby Line, VT 05823 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.
Zone 4b (-25 to -20°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 Derby Line, not a forecast for this year.
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.
How much risk comes with planting early here
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 37,435 of 40,283 ZIP codes nationally. Within VT, it ranks 193 of 330.
Learn more
Before leaning on 05823's figures: local microclimates explains what one yard in Derby Line can differ from the 05823 normal, while zone vs. frost date explains why Zone 4b and Derby Line's frost date answer different questions.