Griffith, IN 46319 Frost Dates
46319, near Griffith, IN: the frost window
Typically, the last spring freeze lands around 04/23, roughly 238 days out. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
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 Griffith, not a forecast for this year.
Stretching the season past the first frost
Griffith'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.
The actual range around Griffith's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Griffith against the rest of the dataset
About 179 days separate Griffith's last and first frost, putting it 25,220 of 40,283 ZIP codes nationally. Within IN, it ranks 528 of 927.
Learn more
Two guides worth reading on 46319: zone vs. frost date, on why Zone 6a and Griffith's frost date answer different questions, and the frost range, on how to read the range around Griffith's dates instead of trusting one.