Lebanon, NH 03240 Frost Dates
When can you plant in Lebanon, NH?
Around 05/21 is the usual last spring frost, about 266 days away. The first fall frost typically arrives around 09/26, about 127 frost-free days later.
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.
What to do before the first frost
About 4 weeks of growing season left in Lebanon before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Lebanon's last frost
05/21 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 06/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lebanon compares
At roughly 127 frost-free days, Lebanon places 38,608 of 40,283 ZIP codes in this dataset. Within NH, it ranks 244 of 260.
Learn more
zone vs. frost date covers why Zone 5a and Lebanon's frost date answer different questions. the frost range covers how to read the range around Lebanon's dates instead of trusting one.