Sullivan City, TX 78588 Frost Dates
When can you plant in Sullivan City, TX?
Around 01/22 is the usual last spring frost, about 147 days away. The first fall frost typically arrives around 12/19, about 333 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sullivan City in Zone 9b (25 to 30°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 16 weeks of growing season left in Sullivan City 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
01/22 is the middle of 30 years of NOAA records, not a promise. Plant by 03/05 and you're betting against frost in roughly 9 years out of 10. 12/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sullivan City compares
Sullivan City's growing season runs about 333 days, ranking 2,849 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 107 of 2,558.
Learn more
zone vs. frost date covers why Zone 9b and Sullivan City's frost date answer different questions. the frost range covers how to read the range around Sullivan City's dates instead of trusting one.