Castalia, OH 43464 Frost Dates
When can you plant in Castalia, OH?
The last spring frost here typically falls around 04/10, about 225 days from today. The first fall frost typically arrives around 11/05, about 209 frost-free days later.
Zone 6b (-5 to 0°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 Castalia, not a forecast for this year.
What to do before the first frost
About 10 weeks of growing season left in Castalia before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/10 isn't a guarantee
04/10 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 and you're betting against frost in roughly 9 years out of 10. 04/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Castalia compares
Castalia's growing season runs about 209 days, ranking 15,348 of 40,283 US ZIP codes measured here, longest to shortest. Within OH, it ranks 54 of 1,383.
Learn more
the frost range covers how to read the range around Castalia's dates instead of trusting one. local microclimates covers what one yard in Castalia can differ from the 43464 normal.