Hillsboro, IN 47949 Frost Dates
When can you plant in Hillsboro, IN?
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/12, about 167 frost-free days later.
Hillsboro 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
About 6 weeks of growing season left in Hillsboro before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Hillsboro's last frost
04/27 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. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hillsboro compares
At roughly 167 frost-free days, Hillsboro places 30,143 of 40,283 ZIP codes in this dataset. Within IN, it ranks 856 of 927.
Learn more
zone vs. frost date covers why Zone 6a and Hillsboro's frost date answer different questions. the frost range covers how to read the range around Hillsboro's dates instead of trusting one.