Keene, NH 03441 Frost Dates
Frost dates for Keene, NH, ZIP 03441
The last spring frost here typically falls around 05/14, about 259 days from today. The first fall frost typically arrives around 10/01, about 138 frost-free days later.
The USDA Plant Hardiness Zone Map puts Keene in Zone 5b (-15 to -10°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 5b around Keene has about 5 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.
The actual range around Keene's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Keene compares
About 138 days separate Keene's last and first frost, putting it 37,342 of 40,283 ZIP codes nationally. Within NH, it ranks 194 of 260.
Learn more
zone vs. frost date explains why Zone 5b and Keene's frost date answer different questions, and the frost range explains how to read the range around Keene's dates instead of trusting one.