Royal Center, IN 46978 Frost Dates
Frost dates for Royal Center, IN, ZIP 46978
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/23, about 185 frost-free days later.
Royal Center 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.
What to do before the first frost
Zone 6a around Royal Center has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Royal Center's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Royal Center compares
Royal Center's growing season runs about 185 days, ranking 23,254 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 385 of 927.
Learn more
the frost range explains how to read the range around Royal Center's dates instead of trusting one, and local microclimates explains what one yard in Royal Center can differ from the 46978 normal.