Jasper, IN 47545 Frost Dates
47545, near Jasper, IN: the frost window
Typically, the last spring freeze lands around 04/15, roughly 230 days out. Fall's first freeze usually shows up around 10/23, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Jasper 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
Jasper'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 04/15 isn't a guarantee
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/02 and only about 1 year in 10 sees frost after that.
Jasper against the rest of the dataset
Jasper's growing season runs about 189 days, ranking 21,440 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 272 of 927.
Learn more
Two guides worth reading on 47545: local microclimates, on what one yard in Jasper can differ from the 47545 normal, and zone vs. frost date, on why Zone 6b and Jasper's frost date answer different questions.