Boise City, OK 73933 Frost Dates
73933, near Boise City, OK: the frost window
Around 04/29 is the usual last spring frost, about 244 days away. Fall's first freeze usually shows up around 10/13, roughly 166 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Boise City in Zone 6b (-5 to 0°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
Boise City's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Boise City against the rest of the dataset
At roughly 166 frost-free days, Boise City places 30,409 of 40,283 ZIP codes in this dataset. Within OK, it ranks 764 of 764.
Learn more
Two guides worth reading on 73933: zone vs. frost date, on why Zone 6b and Boise City's frost date answer different questions, and the frost range, on how to read the range around Boise City's dates instead of trusting one.