Sapulpa, OK 74066 Frost Dates
74066, near Sapulpa, OK: the frost window
Typically, the last spring freeze lands around 03/30, roughly 214 days out. Fall's first freeze usually shows up around 11/04, roughly 220 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Sapulpa 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
Sapulpa's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
03/30 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 04/17 and only about 1 year in 10 sees frost after that.
Sapulpa against the rest of the dataset
Sapulpa's growing season runs about 220 days, ranking 12,722 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 165 of 764.
Learn more
Two guides worth reading on 74066: local microclimates, on what one yard in Sapulpa can differ from the 74066 normal, and zone vs. frost date, on why Zone 7b and Sapulpa's frost date answer different questions.