Derby Line, VT 03592 Frost Dates
Frost dates for Derby Line, VT, ZIP 03592
Typically, the last spring freeze lands around 05/25, roughly 270 days out. The first fall frost typically arrives around 09/24, about 121 frost-free days later.
Zone 4a (-30 to -25°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.
What to do before the first frost
Zone 4a around Derby Line 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.
Why 05/25 isn't a guarantee
05/25 is the middle of 30 years of NOAA records, not a promise. Plant by 05/09 and you're betting against frost in roughly 9 years out of 10. 06/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Derby Line compares
At roughly 121 frost-free days, Derby Line places 39,029 of 40,283 ZIP codes in this dataset. Within VT, it ranks 307 of 330.
Learn more
local microclimates explains what one yard in Derby Line can differ from the 03592 normal, and zone vs. frost date explains why Zone 4a and Derby Line's frost date answer different questions.