Morrisville, VT 05657 Frost Dates
05657, near Morrisville, VT: the frost window
Around 05/20 is the usual last spring frost, about 265 days away. Fall's first freeze usually shows up around 09/28, roughly 129 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Morrisville in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Morrisville'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.
How much risk comes with planting early here
05/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/04 and only about 1 year in 10 sees frost after that.
Morrisville against the rest of the dataset
Morrisville's growing season runs about 129 days, ranking 38,464 of 40,283 US ZIP codes measured here, longest to shortest. Within VT, it ranks 286 of 330.
Learn more
Two guides worth reading on 05657: local microclimates, on what one yard in Morrisville can differ from the 05657 normal, and zone vs. frost date, on why Zone 4b and Morrisville's frost date answer different questions.