Lebanon, NH 05055 Frost Dates
Frost dates for Lebanon, NH, ZIP 05055
Typically, the last spring freeze lands around 05/01, roughly 246 days out. The first fall frost typically arrives around 10/13, about 162 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
Zone 5a around Lebanon has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lebanon compares
About 162 days separate Lebanon's last and first frost, putting it 31,676 of 40,283 ZIP codes nationally. Within NH, it ranks 50 of 260.
Learn more
zone vs. frost date explains why Zone 5a and Lebanon's frost date answer different questions, and the frost range explains how to read the range around Lebanon's dates instead of trusting one.