Westfield, IN 46074 Frost Dates
46074, near Westfield, IN: the frost window
Around 04/18 is the usual last spring frost, about 233 days away. Fall's first freeze usually shows up around 10/26, roughly 190 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Westfield in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Westfield's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Westfield against the rest of the dataset
Westfield's growing season runs about 190 days, ranking 21,012 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 256 of 927.
Learn more
Two guides worth reading on 46074: zone vs. frost date, on why Zone 6a and Westfield's frost date answer different questions, and the frost range, on how to read the range around Westfield's dates instead of trusting one.