Greenfield, IN 46129 Frost Dates
Frost dates for Greenfield, IN, ZIP 46129
Typically, the last spring freeze lands around 04/19, roughly 234 days out. The first fall frost typically arrives around 10/22, about 185 frost-free days later.
Zone 6a (-10 to -5°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 Greenfield, not a forecast for this year.
What to do before the first frost
Zone 6a around Greenfield has about 8 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.
The actual range around Greenfield's last frost
04/19 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 Greenfield compares
Greenfield's growing season runs about 185 days, ranking 23,074 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 362 of 927.
Learn more
the frost range explains how to read the range around Greenfield's dates instead of trusting one, and local microclimates explains what one yard in Greenfield can differ from the 46129 normal.