Detroit, TX 75436 Frost Dates
When can you plant in Detroit, TX?
Typically, the last spring freeze lands around 03/20, roughly 204 days out. The first fall frost typically arrives around 11/10, about 233 frost-free days later.
The USDA Plant Hardiness Zone Map puts Detroit in Zone 8a (10 to 15°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
About 11 weeks of growing season left in Detroit before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/20 isn't a guarantee
03/20 is the middle of 30 years of NOAA records, not a promise. Plant by 02/28 and you're betting against frost in roughly 9 years out of 10. 04/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Detroit compares
Detroit's growing season runs about 233 days, ranking 9,952 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 2,106 of 2,558.
Learn more
zone vs. frost date covers why Zone 8a and Detroit's frost date answer different questions. the frost range covers how to read the range around Detroit's dates instead of trusting one.