Plainfield, IN 46168 Frost Dates
Frost dates for Plainfield, IN, ZIP 46168
The last spring frost here typically falls around 04/12, about 227 days from today. The first fall frost typically arrives around 10/27, about 196 frost-free days later.
The USDA Plant Hardiness Zone Map puts Plainfield in Zone 6a (-10 to -5°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 6a around Plainfield has about 9 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.
How much risk comes with planting early here
04/12 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Plainfield compares
At roughly 196 frost-free days, Plainfield places 18,912 of 40,283 ZIP codes in this dataset. Within IN, it ranks 162 of 927.
Learn more
zone vs. frost date explains why Zone 6a and Plainfield's frost date answer different questions, and the frost range explains how to read the range around Plainfield's dates instead of trusting one.