Derby Line, VT 05903 Frost Dates
Frost dates for Derby Line, VT, ZIP 05903
The last spring frost here typically falls around 05/25, about 270 days from today. The first fall frost typically arrives around 09/22, about 120 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 05/08 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
About 120 days separate Derby Line's last and first frost, putting it 39,090 of 40,283 ZIP codes nationally. Within VT, it ranks 309 of 330.
Learn more
the frost range explains how to read the range around Derby Line's dates instead of trusting one, and local microclimates explains what one yard in Derby Line can differ from the 05903 normal.