Keene, NH 03449 Frost Dates
Frost dates for Keene, NH, ZIP 03449
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 10/06, about 154 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Keene, not a forecast for this year.
What to do before the first frost
Zone 6a around Keene has about 6 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
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Keene compares
At roughly 154 frost-free days, Keene places 34,218 of 40,283 ZIP codes in this dataset. Within NH, it ranks 106 of 260.
Learn more
local microclimates explains what one yard in Keene can differ from the 03449 normal, and zone vs. frost date explains why Zone 6a and Keene's frost date answer different questions.