Mount Vernon, IN 47620 Frost Dates
Frost dates for Mount Vernon, IN, ZIP 47620
Typically, the last spring freeze lands around 04/07, roughly 222 days out. The first fall frost typically arrives around 10/28, about 202 frost-free days later.
Mount Vernon sits in USDA Zone 7a (0 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 7a around Mount Vernon 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.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/25 and you're betting against frost in roughly 9 years out of 10. 04/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mount Vernon compares
Mount Vernon's growing season runs about 202 days, ranking 17,223 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 82 of 927.
Learn more
the frost range explains how to read the range around Mount Vernon's dates instead of trusting one, and local microclimates explains what one yard in Mount Vernon can differ from the 47620 normal.