Boston, IN 47324 Frost Dates
Frost dates for Boston, IN, ZIP 47324
Around 04/25 is the usual last spring frost, about 240 days away. The first fall frost typically arrives around 10/20, about 176 frost-free days later.
Boston 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
Zone 6a around Boston has about 8 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.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Boston compares
Boston's growing season runs about 176 days, ranking 26,661 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 619 of 927.
Learn more
the frost range explains how to read the range around Boston's dates instead of trusting one, and local microclimates explains what one yard in Boston can differ from the 47324 normal.