Bristow, OK 74046 Frost Dates
Bristow, OK: when does the frost end?
Typically, the last spring freeze lands around 03/30, roughly 214 days out. Fall's first freeze usually shows up around 11/04, roughly 220 days after the last spring frost.
Zone 7a (0 to 5°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 Bristow, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Bristow's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/30 isn't a guarantee
03/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/17 and only about 1 year in 10 sees frost after that.
Bristow against the rest of the dataset
Bristow's growing season runs about 220 days, ranking 12,806 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 199 of 764.
Learn more
Before leaning on 74046's figures: the frost range explains how to read the range around Bristow's dates instead of trusting one, while local microclimates explains what one yard in Bristow can differ from the 74046 normal.