Lebanon, NH 05070 Frost Dates
05070, near Lebanon, NH: the frost window
Around 05/09 is the usual last spring frost, about 254 days away. Fall's first freeze usually shows up around 10/02, roughly 145 days after the last spring frost.
Lebanon sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Lebanon's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/09 isn't a guarantee
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Lebanon against the rest of the dataset
Lebanon's growing season runs about 145 days, ranking 36,170 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 172 of 260.
Learn more
Two guides worth reading on 05070: the frost range, on how to read the range around Lebanon's dates instead of trusting one, and local microclimates, on what one yard in Lebanon can differ from the 05070 normal.