Hammon, OK 73650 Frost Dates
73650, near Hammon, OK: the frost window
Typically, the last spring freeze lands around 04/13, roughly 228 days out. Fall's first freeze usually shows up around 10/28, roughly 197 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hammon in Zone 7a (0 to 5°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
Hammon'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
04/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Hammon against the rest of the dataset
Hammon's growing season runs about 197 days, ranking 18,793 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 687 of 764.
Learn more
Two guides worth reading on 73650: zone vs. frost date, on why Zone 7a and Hammon's frost date answer different questions, and the frost range, on how to read the range around Hammon's dates instead of trusting one.