Spring is the short answer. Late March through May is the sweet spot for laying sod in the Dallas-Fort Worth area. Soil temps are climbing past 65°F, you're getting decent rainfall, and the grass has a full growing season ahead of it to put down roots before winter.
But the real answer depends on what type of grass you're putting down.
Bermuda Grass
Bermuda is the workhorse of North Texas lawns. Full sun, handles foot traffic, recovers fast from damage. It greens up earlier than other warm-season grasses, so you can lay Bermuda sod as early as late March if the ground isn't frozen. The ideal window runs through June. Bermuda goes dormant and turns brown in winter, which bothers some people, but it'll come back strong every spring without fail.
Tifway 419 is the most common Bermuda variety installed around DFW. It's dense, dark green, and handles our clay soil well.
St. Augustine
St. Augustine needs it warmer. Wait until late April or May when soil temps are consistently above 70°F. This grass handles partial shade better than Bermuda, which makes it a good pick if you've got mature trees. The trade-off: it needs more water and doesn't bounce back from heavy foot traffic as quickly.
Raleigh and Palmetto are the two St. Augustine varieties you'll see most in DFW. Raleigh is the standard. Palmetto handles shade a bit better.
Zoysia
Zoysia is the "set it and forget it" option. Slower growing, so it needs less mowing. Creates a thick, dense mat that chokes out weeds on its own. You can technically lay Zoysia sod year-round since it establishes even while dormant, but spring and early fall give you the best results. Expect it to take longer to fill in compared to Bermuda.
What About Fall?
September and early October work well too. The heat breaks, you get some rain, and the sod has time to root before the first freeze. Just make sure you're laying it at least three weeks before Thanksgiving. After that, you're gambling with cold snaps.
Summer Sod? It's Doable.
You can lay sod in July and August in DFW. People do it all the time. But you'll be watering twice a day, sometimes three times, and your water bill is going to hurt. If you've got an irrigation system with a timer, summer installs are manageable. Without one, you're chained to your hose for two weeks straight.
Pro tip from our crew: The number one reason new sod fails in North Texas is skipping the soil prep. Our clay soil is compacted and doesn't drain well. We always till in compost before laying sod. It costs a little more upfront but saves you from replacing dead patches later.
Winter Sod in DFW
DFW winters are mild enough that you can lay sod in December or January. It won't look green until spring, and it'll establish slowly, but it works. Winter sod actually needs less water since the grass is dormant. If you're closing on a house and the builder left you with a mud pit, winter sod is better than waiting four months.
The key with any season: water immediately after installation. Soak it. You want 4 to 6 inches of moisture penetration on day one. Then water daily for the first two weeks, back off to every other day for weeks three and four, then settle into a regular schedule.