Merrillville, IN 46325 Frost Dates
Frost dates for Merrillville, IN, ZIP 46325
The last spring frost here typically falls around 04/29, about 244 days from today. The first fall frost typically arrives around 10/16, about 171 frost-free days later.
Merrillville 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
Zone 6a around Merrillville 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 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/14 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Merrillville compares
At roughly 171 frost-free days, Merrillville places 28,591 of 40,283 ZIP codes in this dataset. Within IN, it ranks 752 of 927.
Learn more
the frost range explains how to read the range around Merrillville's dates instead of trusting one, and local microclimates explains what one yard in Merrillville can differ from the 46325 normal.