Denver, IN 46958 Frost Dates
46958, near Denver, IN: the frost window
The last spring frost here typically falls around 04/20, about 235 days from today. Fall's first freeze usually shows up around 10/23, roughly 185 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Denver 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
Denver'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 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 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.
Denver against the rest of the dataset
About 185 days separate Denver's last and first frost, putting it 23,291 of 40,283 ZIP codes nationally. Within IN, it ranks 387 of 927.
Learn more
Two guides worth reading on 46958: the frost range, on how to read the range around Denver's dates instead of trusting one, and local microclimates, on what one yard in Denver can differ from the 46958 normal.