Manchester, NH 03109 Frost Dates
03109, near Manchester, NH: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/11, roughly 164 days after the last spring frost.
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.
Stretching the season past the first frost
Manchester's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Manchester against the rest of the dataset
At roughly 164 frost-free days, Manchester places 30,820 of 40,283 ZIP codes in this dataset. Within NH, it ranks 33 of 260.
Learn more
Two guides worth reading on 03109: the frost range, on how to read the range around Manchester's dates instead of trusting one, and local microclimates, on what one yard in Manchester can differ from the 03109 normal.