New Harmony, IN 47631 Frost Dates
47631, near New Harmony, IN: the frost window
Typically, the last spring freeze lands around 04/07, roughly 222 days out. Fall's first freeze usually shows up around 10/25, roughly 201 days after the last spring frost.
New Harmony sits in USDA Zone 7a (0 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
New Harmony's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/23 and only about 1 year in 10 sees frost after that.
New Harmony against the rest of the dataset
About 201 days separate New Harmony's last and first frost, putting it 17,609 of 40,283 ZIP codes nationally. Within IN, it ranks 109 of 927.
Learn more
Two guides worth reading on 47631: zone vs. frost date, on why Zone 7a and New Harmony's frost date answer different questions, and the frost range, on how to read the range around New Harmony's dates instead of trusting one.