Tiffin, OH 44809 Frost Dates
Frost dates for Tiffin, OH, ZIP 44809
The last spring frost here typically falls around 04/21, about 236 days from today. The first fall frost typically arrives around 10/24, about 183 frost-free days later.
Tiffin sits in USDA Zone 6b (-5 to 0°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 6b around Tiffin 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 Tiffin's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/08 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 Tiffin compares
At roughly 183 frost-free days, Tiffin places 23,782 of 40,283 ZIP codes in this dataset. Within OH, it ranks 689 of 1,383.
Learn more
local microclimates explains what one yard in Tiffin can differ from the 44809 normal, and zone vs. frost date explains why Zone 6b and Tiffin's frost date answer different questions.