Putnam, OK 73659 Frost Dates
Putnam, OK: when does the frost end?
Around 04/08 is the usual last spring frost, about 223 days away. Fall's first freeze usually shows up around 11/01, roughly 204 days after the last spring frost.
Putnam sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 9 weeks until Putnam's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/08 isn't a guarantee
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.
Putnam against the rest of the dataset
Putnam's growing season runs about 204 days, ranking 16,813 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 622 of 764.
Learn more
Before leaning on 73659's figures: local microclimates explains what one yard in Putnam can differ from the 73659 normal, while zone vs. frost date explains why Zone 7a and Putnam's frost date answer different questions.