If you’re planning a new lawn in Oklahoma, knowing when to plant bermuda seed is the most important step for success. Getting the timing right makes all the difference between a patchy struggle and a thick, resilient turf. This guide will walk you through the optimal schedule and the simple steps to ensure your bermudagrass thrives in our unique climate.
Bermudagrass is a fantastic choice for Oklahoma lawns. It loves the heat, tolerates drought once established, and can handle the heavy foot traffic of a busy family. But it’s a warm-season grass, which means it has very specific needs for germination and growth. Planting at the wrong time is the number one reason for seeding failure.
When to Plant Bermuda Seed in Oklahoma
The perfect window for seeding bermuda in Oklahoma is relatively narrow. You must wait until the soil is consistently warm enough for the tiny seeds to sprout.
The ideal time is late spring, specifically from mid-May through late June. During this period, soil temperatures at a 2-inch depth reliably reach and stay above 65°F, which is the magic number for bermuda germination. Air temperatures are also consistently warm, supporting strong seedling growth.
Planting too early in April or early May is a common mistake. Cool soil and unexpected late frosts can cause the seeds to rot or the tender seedlings to die. If you miss the spring window, a secondary option is to aim for late summer, around early to mid-August. This gives the grass enough time to establish before the first fall frost, but it’s riskier than the spring period due to potential early cold snaps.
Why Soil Temperature is Your Best Guide
Forget just looking at the calendar. Your most reliable indicator is soil temperature. You can use a simple soil thermometer to check.
- Target Germination Range: 65°F – 70°F minimum.
- Optimal Growth Range: 75°F – 90°F.
- Seeds will not germinate in cool soil, and growth slows dramatically when temperatures drop.
Many university extension websites offer real-time soil temperature data for Oklahoma, which can be a huge help in planning your seeding project.
Preparing Your Site for Seeding
Good preparation is 80% of the battle. A well-prepared seedbed gives your bermuda seeds the best possible start.
- Clear the Area: Remove all weeds, rocks, and existing vegetation. Use a non-selective herbicide if needed, but allow ample time for it to break down before seeding.
- Test Your Soil: Contact your local OSU County Extension office for a soil test kit. This tells you exactly what nutrients your soil lacks.
- Amend the Soil: Based on your test results, add lime to raise pH or sulfur to lower it. Bermudagrass prefers a pH between 6.0 and 7.0.
- Till and Level: Till the soil to a depth of 4-6 inches to loosen it. Rake it smooth, removing any debris. A firm, level seedbed prevents water pooling and ensures good seed-to-soil contact.
The Seeding Process: Step-by-Step
Once your site is prepped and temperatures are right, it’s time to seed.
1. Choosing Your Seed
Select a high-quality, hulled bermudagrass seed variety suited for Oklahoma. Hulled seeds germinate faster. Common improved varieties include ‘Riviera’ or ‘Yukon’, which offer better cold tolerance and density.
2. Seeding Rate and Method
Follow the recommended rate on the bag, typically 1-2 pounds per 1,000 square feet. Using a broadcast spreader helps ensure even coverage. To get good coverage, sow half the seed walking in one direction, then sow the other half walking perpendicular to your first pass.
3. Covering the Seed
Lightly rake the area to cover the seeds with about 1/8 to 1/4 inch of soil. You can also roll the area with a light lawn roller to press the seeds into the soil. Never leave seeds exposed on the surface; they will dry out or be eaten by birds.
4. The First Watering
Water immediately after seeding. The goal is to keep the top inch of soil consistently moist, but not soggy, for the first 2-3 weeks. This may mean light watering 2-3 times a day for very short periods until germination occurs, which usually takes 7-14 days.
Caring for Your New Bermuda Lawn
Post-planting care is critical. Your seedlings are vulnerable and need gentle, consistent attention.
- Watering: After germination, gradually reduce frequency but increase the amount of water to encourage deeper root growth. Aim for about 1 inch of water per week, including rainfall.
- First Mowing: Wait until the grass reaches about 3 inches tall before the first mow. Set your mower high (around 2-2.5 inches) and ensure the blades are sharp. Never remove more than one-third of the grass blade at a time.
- Initial Fertilizing: Apply a starter fertilizer at seeding. Wait 4-6 weeks after germination to apply your next, light feeding of a balanced fertilizer.
- Weed Control: Do not use any weed preventers or post-emergent herbicides until after you have mowed the new lawn at least 3-4 times. The young grass is very sensitive to chemicals.
Common Mistakes to Avoid
Steer clear of these pitfalls to save yourself time and money.
- Planting Too Early: Impatience leads to wasted seed. Wait for warm soil.
- Poor Seed-to-Soil Contact: Uncovered seed will not germinate properly.
- Overwatering or Underwatering: Both can kill seedlings. Keep the soil surface moist like a wrung-out sponge.
- Using the Wrong Seed: Don’t choose a variety not suited for our climate zone. Check with local suppliers for the best options.
- Heavy Foot Traffic: Keep people and pets off the new lawn until it’s well established, usually after several mowings.
FAQ: Seeding Bermuda Grass in Oklahoma
Can I plant bermuda seed in the fall in Oklahoma?
It is not recommended. Fall seeding rarely gives the grass enough time to develop a deep root system before winter dormancy, making it susceptible to winterkill.
What is the best month to plant bermuda grass seed?
In Oklahoma, the best single month is typically June. The soil is warm, and there’s plenty of growing season ahead.
How long does it take for bermuda seed to grow?
You’ll see germination in 7-14 days under ideal conditions, but it takes a full growing season for the lawn to become fully established and dense.
Can I mix bermuda seed with fescue?
It’s not adviseable. Bermuda is a warm-season grass that goes brown in winter, while fescue is a cool-season grass. They compete with each other and often result in a patchy, unhealthy lawn.
When is it too late to plant bermuda seed?
If you plant after August 15th, the risk of the seedlings being killed by an early frost increases significantly. It’s better to wait until next spring than to seed too late.
By following these guidelines and paying close attention to timing and soil temperature, you’ll give your new bermuda lawn the foundation it needs. With proper care, you’ll be rewarded with a tough, beautiful turf that can handle Oklahoma’s summers and provide years of enjoyment. Remember, the effort you put in during the planting phase pays off for the entire life of your lawn.