Keene, NH 03450 Frost Dates
When can you plant in Keene, NH?
Around 05/05 is the usual last spring frost, about 250 days away. The first fall frost typically arrives around 10/06, about 154 frost-free days later.
Keene sits in USDA Zone 6a (-10 to -5°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
About 6 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.
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
Keene's growing season runs about 154 days, ranking 34,219 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 107 of 260.
Learn more
local microclimates covers what one yard in Keene can differ from the 03450 normal. zone vs. frost date covers why Zone 6a and Keene's frost date answer different questions.