Grabill, IN 46741 Frost Dates
Frost dates for Grabill, IN, ZIP 46741
Around 04/27 is the usual last spring frost, about 242 days away. The first fall frost typically arrives around 10/19, about 174 frost-free days later.
The USDA Plant Hardiness Zone Map puts Grabill 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 Grabill has about 7 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 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/13 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grabill compares
Grabill's growing season runs about 174 days, ranking 27,547 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 671 of 927.
Learn more
the frost range explains how to read the range around Grabill's dates instead of trusting one, and local microclimates explains what one yard in Grabill can differ from the 46741 normal.