Franklin, NH 03222 Frost Dates
When can you plant in Franklin, NH?
The last spring frost here typically falls around 05/21, about 266 days from today. The first fall frost typically arrives around 09/26, about 127 frost-free days later.
The USDA Plant Hardiness Zone Map puts Franklin in Zone 5b (-15 to -10°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 4 weeks of growing season left in Franklin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/21 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 06/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Franklin compares
Franklin's growing season runs about 127 days, ranking 38,615 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 251 of 260.
Learn more
zone vs. frost date covers why Zone 5b and Franklin's frost date answer different questions. the frost range covers how to read the range around Franklin's dates instead of trusting one.