Speedway, IN 46221 Frost Dates
Frost dates for Speedway, IN, ZIP 46221
Typically, the last spring freeze lands around 04/15, roughly 230 days out. The first fall frost typically arrives around 10/26, about 193 frost-free days later.
Speedway sits in USDA Zone 6b (-5 to 0°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 6b around Speedway 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 Speedway's last frost
04/15 is the middle of 30 years of NOAA records, not a promise. Plant by 04/02 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Speedway compares
Speedway's growing season runs about 193 days, ranking 19,756 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 205 of 927.
Learn more
the frost range explains how to read the range around Speedway's dates instead of trusting one, and local microclimates explains what one yard in Speedway can differ from the 46221 normal.