Middletown, CT 06424 Frost Dates
Frost dates for Middletown, CT, ZIP 06424
Around 04/17 is the usual last spring frost, about 232 days away. The first fall frost typically arrives around 10/26, about 191 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 Middletown, not a forecast for this year.
What to do before the first frost
Zone 6b around Middletown 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.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Middletown compares
Middletown's growing season runs about 191 days, ranking 20,691 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 200 of 391.
Learn more
the frost range explains how to read the range around Middletown's dates instead of trusting one, and local microclimates explains what one yard in Middletown can differ from the 06424 normal.