Troy, IN 47531 Frost Dates
Troy, IN: when does the frost end?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. Fall's first freeze usually shows up around 10/26, roughly 197 days after the last spring frost.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Troy, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Troy's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/11 isn't a guarantee
04/11 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 04/30 and only about 1 year in 10 sees frost after that.
Troy against the rest of the dataset
Troy's growing season runs about 197 days, ranking 18,810 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 153 of 927.
Learn more
Before leaning on 47531's figures: zone vs. frost date explains why Zone 7a and Troy's frost date answer different questions, while the frost range explains how to read the range around Troy's dates instead of trusting one.