Keene, NH 03443 Frost Dates
When can you plant in Keene, NH?
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 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
About 5 weeks of growing season left in Keene before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/14 isn't a guarantee
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
Keene's growing season runs about 138 days, ranking 37,343 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 195 of 260.
Learn more
the frost range covers how to read the range around Keene's dates instead of trusting one. local microclimates covers what one yard in Keene can differ from the 03443 normal.