Merrillville, IN 46410 Frost Dates
Merrillville, IN: when does the frost end?
Around 04/22 is the usual last spring frost, about 237 days away. Fall's first freeze usually shows up around 10/25, roughly 185 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 8 weeks until Merrillville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Merrillville against the rest of the dataset
Merrillville's growing season runs about 185 days, ranking 23,058 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 358 of 927.
Learn more
Before leaning on 46410's figures: local microclimates explains what one yard in Merrillville can differ from the 46410 normal, while zone vs. frost date explains why Zone 6a and Merrillville's frost date answer different questions.