Keene, NH 03462 Frost Dates
Keene, NH: when does the frost end?
Around 05/14 is the usual last spring frost, about 259 days away. Fall's first freeze usually shows up around 10/01, roughly 138 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Keene in Zone 6a (-10 to -5°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
With roughly 5 weeks until Keene's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Keene's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Keene against the rest of the dataset
At roughly 138 frost-free days, Keene places 37,349 of 40,283 ZIP codes in this dataset. Within NH, it ranks 201 of 260.
Learn more
Before leaning on 03462's figures: local microclimates explains what one yard in Keene can differ from the 03462 normal, while zone vs. frost date explains why Zone 6a and Keene's frost date answer different questions.