Manchester, NH 03036 Frost Dates
When can you plant in Manchester, NH?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/11, about 162 frost-free days later.
Manchester 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 Manchester before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Manchester compares
Manchester's growing season runs about 162 days, ranking 31,561 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 34 of 260.
Learn more
the frost range covers how to read the range around Manchester's dates instead of trusting one. local microclimates covers what one yard in Manchester can differ from the 03036 normal.