Lyons, IN 47443 Frost Dates
Frost dates for Lyons, IN, ZIP 47443
Typically, the last spring freeze lands around 04/09, roughly 224 days out. The first fall frost typically arrives around 10/25, about 197 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 Lyons, not a forecast for this year.
What to do before the first frost
Zone 6b around Lyons 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 Lyons's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Plant by 03/27 and you're betting against frost in roughly 9 years out of 10. 04/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lyons compares
Lyons's growing season runs about 197 days, ranking 18,757 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 144 of 927.
Learn more
zone vs. frost date explains why Zone 6b and Lyons's frost date answer different questions, and the frost range explains how to read the range around Lyons's dates instead of trusting one.