Plymouth, IN 46563 Frost Dates
46563, near Plymouth, IN: the frost window
Around 05/01 is the usual last spring frost, about 246 days away. Fall's first freeze usually shows up around 10/13, roughly 163 days after the last spring frost.
Plymouth sits in USDA Zone 6a (-10 to -5°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.
Stretching the season past the first frost
Plymouth's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Plymouth against the rest of the dataset
At roughly 163 frost-free days, Plymouth places 31,354 of 40,283 ZIP codes in this dataset. Within IN, it ranks 904 of 927.
Learn more
Two guides worth reading on 46563: zone vs. frost date, on why Zone 6a and Plymouth's frost date answer different questions, and the frost range, on how to read the range around Plymouth's dates instead of trusting one.