Porter, OK 74477 Frost Dates
Porter, OK: when does the frost end?
Typically, the last spring freeze lands around 03/29, roughly 213 days out. Fall's first freeze usually shows up around 11/05, roughly 223 days after the last spring frost.
Zone 7b (5 to 10°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 Porter, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Porter's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Porter's last frost
03/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/14 and only about 1 year in 10 sees frost after that.
Porter against the rest of the dataset
At roughly 223 frost-free days, Porter places 12,110 of 40,283 ZIP codes in this dataset. Within OK, it ranks 114 of 764.
Learn more
Before leaning on 74477's figures: the frost range explains how to read the range around Porter's dates instead of trusting one, while local microclimates explains what one yard in Porter can differ from the 74477 normal.