Petersburg, IN 47567 Frost Dates
47567, near Petersburg, IN: the frost window
Around 04/10 is the usual last spring frost, about 225 days away. Fall's first freeze usually shows up around 10/25, roughly 197 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Petersburg in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Petersburg'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.
How much risk comes with planting early here
04/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Petersburg against the rest of the dataset
Petersburg's growing season runs about 197 days, ranking 18,694 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 134 of 927.
Learn more
Two guides worth reading on 47567: local microclimates, on what one yard in Petersburg can differ from the 47567 normal, and zone vs. frost date, on why Zone 6b and Petersburg's frost date answer different questions.