Manchester, NH 03045 Frost Dates
Frost dates for Manchester, NH, ZIP 03045
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/08, about 158 frost-free days later.
The USDA Plant Hardiness Zone Map puts Manchester 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
Zone 6a around Manchester 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.
Why 05/02 isn't a guarantee
05/02 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. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Manchester compares
About 158 days separate Manchester's last and first frost, putting it 32,863 of 40,283 ZIP codes nationally. Within NH, it ranks 70 of 260.
Learn more
the frost range explains how to read the range around Manchester's dates instead of trusting one, and local microclimates explains what one yard in Manchester can differ from the 03045 normal.