Spavinaw, OK 74366 Frost Dates
74366, near Spavinaw, OK: the frost window
Typically, the last spring freeze lands around 04/07, roughly 222 days out. Fall's first freeze usually shows up around 11/02, roughly 209 days after the last spring frost.
Spavinaw sits in USDA Zone 7a (0 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
Spavinaw's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/24 and only about 1 year in 10 sees frost after that.
Spavinaw against the rest of the dataset
At roughly 209 frost-free days, Spavinaw places 15,404 of 40,283 ZIP codes in this dataset. Within OK, it ranks 503 of 764.
Learn more
Two guides worth reading on 74366: local microclimates, on what one yard in Spavinaw can differ from the 74366 normal, and zone vs. frost date, on why Zone 7a and Spavinaw's frost date answer different questions.