Speedway, IN 46224 Frost Dates
46224, near Speedway, IN: the frost window
Around 04/12 is the usual last spring frost, about 227 days away. Fall's first freeze usually shows up around 10/29, roughly 198 days after the last spring frost.
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 Speedway, not a forecast for this year.
Stretching the season past the first frost
Speedway's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Speedway against the rest of the dataset
About 198 days separate Speedway's last and first frost, putting it 18,380 of 40,283 ZIP codes nationally. Within IN, it ranks 120 of 927.
Learn more
Two guides worth reading on 46224: local microclimates, on what one yard in Speedway can differ from the 46224 normal, and zone vs. frost date, on why Zone 6b and Speedway's frost date answer different questions.