Collinsville, OK 74021 Frost Dates
Frost dates for Collinsville, OK, ZIP 74021
Around 03/31 is the usual last spring frost, about 215 days away. The first fall frost typically arrives around 11/04, about 220 frost-free days later.
The USDA Plant Hardiness Zone Map puts Collinsville in Zone 7a (0 to 5°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 7a around Collinsville has about 10 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 03/31 isn't a guarantee
03/31 is the middle of 30 years of NOAA records, not a promise. Plant by 03/11 and you're betting against frost in roughly 9 years out of 10. 04/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Collinsville compares
Collinsville's growing season runs about 220 days, ranking 12,772 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 193 of 764.
Learn more
the frost range explains how to read the range around Collinsville's dates instead of trusting one, and local microclimates explains what one yard in Collinsville can differ from the 74021 normal.