Morrison, OK 73061 Frost Dates
When can you plant in Morrison, OK?
Around 04/08 is the usual last spring frost, about 223 days away. The first fall frost typically arrives around 10/28, about 202 frost-free days later.
Morrison 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.
What to do before the first frost
About 9 weeks of growing season left in Morrison before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/22 and you're betting against frost in roughly 9 years out of 10. 04/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Morrison compares
Morrison's growing season runs about 202 days, ranking 17,314 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 636 of 764.
Learn more
local microclimates covers what one yard in Morrison can differ from the 73061 normal. zone vs. frost date covers why Zone 7a and Morrison's frost date answer different questions.