Mangum, OK 73554 Frost Dates
73554, near Mangum, OK: the frost window
Around 04/08 is the usual last spring frost, about 223 days away. Fall's first freeze usually shows up around 11/02, roughly 207 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mangum 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
Mangum'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.
How much risk comes with planting early here
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/21 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.
Mangum against the rest of the dataset
About 207 days separate Mangum's last and first frost, putting it 15,828 of 40,283 ZIP codes nationally. Within OK, it ranks 535 of 764.
Learn more
Two guides worth reading on 73554: zone vs. frost date, on why Zone 7b and Mangum's frost date answer different questions, and the frost range, on how to read the range around Mangum's dates instead of trusting one.