Lebanon, NH 05074 Frost Dates
05074, near Lebanon, NH: the frost window
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 10/02, roughly 145 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Lebanon in Zone 5a (-20 to -15°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
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.
How much risk comes with planting early here
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
About 145 days separate Lebanon's last and first frost, putting it 36,171 of 40,283 ZIP codes nationally. Within NH, it ranks 173 of 260.
Learn more
Two guides worth reading on 05074: zone vs. frost date, on why Zone 5a and Lebanon's frost date answer different questions, and the frost range, on how to read the range around Lebanon's dates instead of trusting one.