Winooski, VT 05439 Frost Dates
Frost dates for Winooski, VT, ZIP 05439
Typically, the last spring freeze lands around 04/29, roughly 244 days out. The first fall frost typically arrives around 10/15, about 169 frost-free days later.
Zone 5a (-20 to -15°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 Winooski, not a forecast for this year.
What to do before the first frost
Zone 5a around Winooski has about 7 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.
How much risk comes with planting early here
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Winooski compares
About 169 days separate Winooski's last and first frost, putting it 29,393 of 40,283 ZIP codes nationally. Within VT, it ranks 20 of 330.
Learn more
local microclimates explains what one yard in Winooski can differ from the 05439 normal, and zone vs. frost date explains why Zone 5a and Winooski's frost date answer different questions.