Rochester, IN 46922 Frost Dates
Rochester, IN: when does the frost end?
The last spring frost here typically falls around 04/23, about 238 days from today. Fall's first freeze usually shows up around 10/21, roughly 180 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Rochester 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
With roughly 8 weeks until Rochester's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/23 isn't a guarantee
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 05/09 and only about 1 year in 10 sees frost after that.
Rochester against the rest of the dataset
At roughly 180 frost-free days, Rochester places 24,845 of 40,283 ZIP codes in this dataset. Within IN, it ranks 483 of 927.
Learn more
Before leaning on 46922's figures: local microclimates explains what one yard in Rochester can differ from the 46922 normal, while zone vs. frost date explains why Zone 6a and Rochester's frost date answer different questions.