West Harrison, IN 47060 Frost Dates
Frost dates for West Harrison, IN, ZIP 47060
Around 04/20 is the usual last spring frost, about 235 days away. The first fall frost typically arrives around 10/21, about 182 frost-free days later.
The USDA Plant Hardiness Zone Map puts West Harrison in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6b around West Harrison has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How West Harrison compares
At roughly 182 frost-free days, West Harrison places 24,304 of 40,283 ZIP codes in this dataset. Within IN, it ranks 457 of 927.
Learn more
the frost range explains how to read the range around West Harrison's dates instead of trusting one, and local microclimates explains what one yard in West Harrison can differ from the 47060 normal.