Marengo, IN 47140 Frost Dates
Frost dates for Marengo, IN, ZIP 47140
The last spring frost here typically falls around 04/21, about 236 days from today. The first fall frost typically arrives around 10/18, about 178 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Marengo, not a forecast for this year.
What to do before the first frost
Zone 6b around Marengo 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.
How much risk comes with planting early here
04/21 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 Marengo compares
Marengo's growing season runs about 178 days, ranking 25,840 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 602 of 927.
Learn more
the frost range explains how to read the range around Marengo's dates instead of trusting one, and local microclimates explains what one yard in Marengo can differ from the 47140 normal.