Keene, NH 03470 Frost Dates
Frost dates for Keene, NH, ZIP 03470
The last spring frost here typically falls around 04/25, about 240 days from today. The first fall frost typically arrives around 10/17, about 175 frost-free days later.
The USDA Plant Hardiness Zone Map puts Keene in Zone 6a (-10 to -5°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 6a around Keene 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.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/13 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Keene compares
About 175 days separate Keene's last and first frost, putting it 26,771 of 40,283 ZIP codes nationally. Within NH, it ranks 6 of 260.
Learn more
local microclimates explains what one yard in Keene can differ from the 03470 normal, and zone vs. frost date explains why Zone 6a and Keene's frost date answer different questions.