Middletown, CT 06455 Frost Dates
Frost dates for Middletown, CT, ZIP 06455
Around 04/26 is the usual last spring frost, about 241 days away. The first fall frost typically arrives around 10/16, about 175 frost-free days later.
Middletown 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 Middletown has about 7 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.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Middletown compares
Middletown's growing season runs about 175 days, ranking 26,736 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 306 of 391.
Learn more
local microclimates explains what one yard in Middletown can differ from the 06455 normal, and zone vs. frost date explains why Zone 6b and Middletown's frost date answer different questions.