Keene, NH 03467 Frost Dates
Frost dates for Keene, NH, ZIP 03467
Typically, the last spring freeze lands around 05/08, roughly 253 days out. The first fall frost typically arrives around 10/03, about 149 frost-free days later.
Keene sits in USDA Zone 5b (-15 to -10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a 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.
How much risk comes with planting early here
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Keene compares
Keene's growing season runs about 149 days, ranking 35,478 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 129 of 260.
Learn more
local microclimates explains what one yard in Keene can differ from the 03467 normal, and zone vs. frost date explains why Zone 5b and Keene's frost date answer different questions.