Guymon, OK 73942 Frost Dates
Frost dates for Guymon, OK, ZIP 73942
Typically, the last spring freeze lands around 04/18, roughly 233 days out. The first fall frost typically arrives around 10/23, about 188 frost-free days later.
The USDA Plant Hardiness Zone Map puts Guymon in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6b around Guymon has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Guymon compares
At roughly 188 frost-free days, Guymon places 21,901 of 40,283 ZIP codes in this dataset. Within OK, it ranks 736 of 764.
Learn more
the frost range explains how to read the range around Guymon's dates instead of trusting one, and local microclimates explains what one yard in Guymon can differ from the 73942 normal.