Tiffin, OH 44883 Frost Dates
When can you plant in Tiffin, OH?
Around 04/21 is the usual last spring frost, about 236 days away. The first fall frost typically arrives around 10/24, about 183 frost-free days later.
The USDA Plant Hardiness Zone Map puts Tiffin in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 8 weeks of growing season left in Tiffin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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
About 183 days separate Tiffin's last and first frost, putting it 23,783 of 40,283 ZIP codes nationally. Within OH, it ranks 690 of 1,383.
Learn more
zone vs. frost date covers why Zone 6a and Tiffin's frost date answer different questions. the frost range covers how to read the range around Tiffin's dates instead of trusting one.