The short answer: most of Texas plants potatoes in late January through February, four to six weeks before the average last frost, once soil temperature holds around 45 to 50 F. Far North Texas and the Panhandle wait until mid-February to March. South Texas and the Rio Grande Valley can start as early as late December or early January.
That is the window. But the window on the calendar and the window in your actual yard are two different things, and confusing them is exactly what costs most Texas gardeners their harvest.
Before you grab seed potatoes, there is one mistake that wrecks more Texas potato crops than any pest, and it is not planting too early. There is also a soil test you can do with your bare hand right now, no thermometer needed, that tells you more than any calendar date. Stick around for the Potatoes at a Glance card at the bottom, save it to your phone before you head out to the garden this weekend.
The Real Planting Window, Region by Region
Texas is too big for one planting date, so think in three bands. South Texas and the Valley (roughly zones 9 and 10), with mild winters and almost no hard freeze risk, plant potatoes late December through January. Central Texas, the Hill Country, Houston, and the Gulf Coast (zones 8 and 8b to 9a) plant late January through mid-February. North Texas, the Panhandle, and West Texas (zones 6b to 7b) wait until mid-February through March, sometimes into early April at higher elevations.
The anchor point everywhere is the same: four to six weeks before your average last frost date. Potato foliage tolerates a light frost and shrugs it off, but a hard freeze on tender new growth will burn it back to the ground.
Your county extension office frost date is a starting point, not gospel for your specific lot.
How to Find Your Actual Window, Not the Textbook One
Here is the part almanacs skip. Soil temperature matters more than the date on the calendar, and your soil is not the same as your neighbor’s three streets over.
Push a soil thermometer four inches deep, or just dig down with your hand. If the soil feels cool but not cold, and a squeeze of it holds together without turning to mud, you are close. You want consistent readings of 45 F or better, ideally trending toward 50 F, for at least a few days running, not just one warm afternoon.
Raised beds and sandy soil warm up a week or two faster than heavy clay in a low spot. South-facing slopes beat shaded, low-lying corners by a similar margin. Walk your own ground before you trust any date someone else gives you.
That soil check also tells you something the calendar cannot: whether your ground has dried out enough to plant without rotting the seed piece.
Plant Too Early, and This Is What Actually Happens
If you assumed planting too early just means a slower start, that guess is too generous. Seed potatoes set into cold, wet soil below 40 F do not just sit dormant, they rot. Waterlogged, chilly ground is the single biggest cause of failed potato starts in Texas, more common than frost damage on the foliage itself.
Frost damage on emerged leaves is recoverable most of the time; the plant regrows from below. Rot in the ground is not recoverable. That seed piece is gone, and you will not know it until you dig weeks later and find nothing but mush.
Planting too late has its own cost, just slower to notice. Texas summers turn brutal fast, and potatoes stop forming tubers once soil temperatures push past 80 F. Plant late and your plants race the heat, often losing.
Both mistakes are avoidable with the same fix: check the soil, not the wall calendar.
Prep to Finish Before the Window Opens
Do this work now, not the weekend you plant. Chit your seed potatoes seven to fourteen days ahead: set them in a bright, cool spot (around 60 to 70 F) until short, sturdy sprouts appear. This gets plants up and growing faster once they hit the ground.
Cut larger seed potatoes into pieces two ounces or so, each with at least one or two eyes, and let the cut sides callus over for a day or two before planting. Planting freshly cut, wet-sided pieces invites rot, especially in Texas’s often-damp early spring soil.
Work your bed to loose, well-draining soil at least eight to ten inches deep. Potatoes hate compaction and standing water more than almost anything else you can do wrong. Mix in compost now if your soil is heavy clay, common across much of North and Central Texas.
Plant seed pieces 3 to 4 inches deep, 12 inches apart in rows spaced 30 to 36 inches, and set them cut-side down.
With prep done and soil checked, the only thing left is knowing which of Texas’s very different climates you are actually gardening in.
Zone Notes That Actually Change Your Date
Zone 6b to 7a (Panhandle, far North Texas, Amarillo, Lubbock corridor): last frost often lands mid to late April. Plant potatoes mid-February through March, and keep row cover handy for a surprise late freeze.
Zone 7b to 8a (Dallas-Fort Worth, much of North and Central Texas): last frost typically mid-March. Plant late January through mid-February.
Zone 8b to 9a (Austin, San Antonio, Houston, Gulf Coast): last frost often late February to early March. Plant late January through February, and watch for early heat cutting the season short.
Zone 9b to 10 (Rio Grande Valley, deep South Texas): frost risk is minimal most winters. Plant December through January, and get a second, fall crop in around September if summer heat has broken.
Know your zone, know your microclimate, and the calendar becomes a suggestion instead of a rule.
Potatoes at a Glance
- When to plant: four to six weeks before your average last frost, once soil hits a steady 45 to 50 F at four inches deep.
- Texas timing by region: South Texas and the Valley, late December through January, Central and Coastal Texas, late January through mid-February, North Texas and Panhandle, mid-February through March.
- Planting depth and spacing: seed pieces 3 to 4 inches deep, 12 inches apart, rows 30 to 36 inches apart.
- Prep beforehand: chit seed potatoes 7 to 14 days ahead, cut into 2 ounce pieces with an eye or two, let cut sides callus a day or two before planting.
- Biggest mistake to avoid: planting into cold, waterlogged soil, which rots seed pieces before they sprout, worse than any light frost on foliage.
- Heat cutoff: tuber formation stalls once soil runs past 80 F, so a too-late planting loses to summer before harvest.
- Harvest timeline: new potatoes in 60 to 70 days, mature storage potatoes in 90 to 120 days depending on variety.
Check your soil before you check the calendar, that single habit prevents most Texas potato failures.
Everything else about growing potatoes well is easier once you get the start right.
