Dannemora, NY 12978 Frost Dates
12978, near Dannemora, NY: the frost window
Around 05/06 is the usual last spring frost, about 251 days away. Fall's first freeze usually shows up around 10/11, roughly 157 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Dannemora 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
Dannemora's growing season runs out in roughly 6 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
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Dannemora against the rest of the dataset
Dannemora's growing season runs about 157 days, ranking 33,333 of 40,283 US ZIP codes measured here, longest to shortest. Within NY, it ranks 1,227 of 1,951.
Learn more
Two guides worth reading on 12978: local microclimates, on what one yard in Dannemora can differ from the 12978 normal, and zone vs. frost date, on why Zone 4b and Dannemora's frost date answer different questions.