London, OH 43140 Frost Dates
London, OH: when does the frost end?
Typically, the last spring freeze lands around 04/24, roughly 239 days out. Fall's first freeze usually shows up around 10/18, roughly 175 days after the last spring frost.
London 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.
Stretching the season past the first frost
With roughly 7 weeks until London's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
London against the rest of the dataset
About 175 days separate London's last and first frost, putting it 26,803 of 40,283 ZIP codes nationally. Within OH, it ranks 1,018 of 1,383.
Learn more
Before leaning on 43140's figures: local microclimates explains what one yard in London can differ from the 43140 normal, while zone vs. frost date explains why Zone 6a and London's frost date answer different questions.