Hartshorne, OK 74545 Frost Dates
Hartshorne, OK: when does the frost end?
Around 03/31 is the usual last spring frost, about 215 days away. Fall's first freeze usually shows up around 11/03, roughly 216 days after the last spring frost.
Zone 7b (5 to 10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Hartshorne, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Hartshorne's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Hartshorne's last frost
03/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/18 and only about 1 year in 10 sees frost after that.
Hartshorne against the rest of the dataset
Hartshorne's growing season runs about 216 days, ranking 13,821 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 331 of 764.
Learn more
Before leaning on 74545's figures: local microclimates explains what one yard in Hartshorne can differ from the 74545 normal, while zone vs. frost date explains why Zone 7b and Hartshorne's frost date answer different questions.