Spiro, OK 74959 Frost Dates
Spiro, OK: when does the frost end?
Around 03/25 is the usual last spring frost, about 209 days away. Fall's first freeze usually shows up around 11/06, roughly 224 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Spiro in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 10 weeks until Spiro's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Spiro's last frost
03/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/11 and only about 1 year in 10 sees frost after that.
Spiro against the rest of the dataset
At roughly 224 frost-free days, Spiro places 11,898 of 40,283 ZIP codes in this dataset. Within OK, it ranks 95 of 764.
Learn more
Before leaning on 74959's figures: local microclimates explains what one yard in Spiro can differ from the 74959 normal, while zone vs. frost date explains why Zone 7b and Spiro's frost date answer different questions.