Keene, NH 03445 Frost Dates
Frost dates for Keene, NH, ZIP 03445
Around 05/14 is the usual last spring frost, about 259 days away. The first fall frost typically arrives around 10/01, about 138 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 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
05/14 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
At roughly 138 frost-free days, Keene places 37,344 of 40,283 ZIP codes in this dataset. Within NH, it ranks 196 of 260.
Learn more
local microclimates explains what one yard in Keene can differ from the 03445 normal, and zone vs. frost date explains why Zone 6a and Keene's frost date answer different questions.