By Landscape Marks – Your DIY Lawn Care Guide
Introduction
Bermuda grass is one of the most resilient and beautiful warm-season grasses. It thrives in hot, sunny climates, creating that rich, thick, carpet-like yard many homeowners dream of. But like every warm-season turf, Bermuda eventually enters dormancy as the days shorten, temperatures cool, and winter approaches. Once it goes brown and dormant, the growing season is over until spring.
The question is: what should you be doing to your Bermuda lawn right now, before dormancy sets in? Many homeowners either do too much or too little at this time of year, leaving their yards vulnerable to weeds, diseases, or spring struggles. This blog will walk you through exactly how to prepare your Bermuda lawn before it turns dormant—covering mowing, watering, fertilization, weed prevention, disease management, soil care, overseeding options, and everything in between.
If you want your lawn to come back lush, green, and healthy next spring, now is the time to act. Let’s dive deep into the best practices for pre-dormancy Bermuda lawn care.
1. Understanding Bermuda Grass Dormancy
Before we get into what to do, it’s important to understand what dormancy actually is. Bermuda grass is a warm-season turf that flourishes when soil temperatures are consistently above 65°F and air temps are between 80–95°F. Once nighttime temperatures dip into the 50s for extended periods and daylight decreases, Bermuda begins slowing growth and eventually turns tan or brown as it enters dormancy.
Dormancy is not death—it’s a survival mechanism. The grass shuts down above-ground growth and conserves energy in its rhizomes and stolons underground. Come spring, when temperatures rise again, it will “wake up” and resume growth. But how healthy and vigorous it wakes up depends heavily on how you prepare it now.
- When does dormancy occur? Typically late fall (October–November) depending on your region.
- Why does it matter? Proper pre-dormancy care ensures strong roots, disease prevention, and less weed pressure in spring.
- What happens if you skip it? You risk patchy regrowth, heavy weed infestation, or even winter kill in colder regions.
2. Final Fertilization: Avoid Nitrogen, Focus on Potassium
One of the most common mistakes homeowners make is applying nitrogen fertilizer too late in the season. Nitrogen promotes leafy growth—which is the last thing Bermuda needs before dormancy. Late nitrogen feeding can leave grass vulnerable to frost damage, winter diseases, and spring stress.
Instead, now is the time to shift focus to potassium (K). Potassium strengthens cell walls, enhances root systems, and improves cold and drought tolerance. Think of it as “winterizer fuel” for your Bermuda lawn.
What to Apply:
- Look for a fertilizer labeled as a winterizer, usually with a low first number (nitrogen) and higher last number (potassium). Example: 5-10-30 or 10-10-20.
- Avoid high-nitrogen formulas like 29-0-10 or 32-0-4 at this stage.
- Apply according to the bag rate, usually 1 lb of actual potassium per 1,000 sq ft.
Pro Tip: If you’ve had a soil test this year, check your potassium levels. Apply only what’s needed. Too much potassium can interfere with other nutrients like magnesium and calcium.
3. Adjusting Your Mowing Routine
Mowing is still important in the weeks leading up to dormancy, but you should adjust your strategy:
- Gradually raise your mowing height by 0.5–1 inch in the last few cuts of the season. This provides more leaf surface for photosynthesis as the grass prepares for winter energy storage.
- Avoid scalping or cutting too short. Low mowing now stresses Bermuda and exposes it to weed competition.
- Final mow: Your last mow before dormancy should leave the lawn at 1.5–2 inches (reel-mowed lawns) or 2–2.5 inches (rotary mowed lawns).
Remember: Clean, sharp blades reduce injury and disease risk. If your mower hasn’t been sharpened this season, now is a good time.
4. Watering Before Dormancy
As Bermuda growth slows, so should your irrigation schedule. You don’t need the heavy watering of midsummer, but you don’t want the soil to completely dry out either.
- Keep watering until the grass is fully dormant.
- Reduce frequency but water deeply when you do (0.5–1 inch per week if rainfall is lacking).
- Right before the first frost, give your lawn a deep soaking. Moist soil retains heat better than dry soil and protects roots from freeze damage.
Tip: If your area is prone to winter droughts, don’t abandon irrigation altogether. Even dormant Bermuda benefits from occasional watering to prevent root desiccation.
5. Pre-Emergent Weed Control
One of the most important steps before dormancy is weed prevention. Cool-season weeds like annual bluegrass (Poa annua), henbit, and chickweed love to invade Bermuda lawns in fall and winter when your turf is sleeping.
Apply a fall pre-emergent herbicide to create a barrier that prevents weed seeds from germinating. Timing is critical: apply when soil temperatures drop to around 70°F and continue until they reach 55°F (use a soil thermometer to monitor).
Best Pre-Emergents for Bermuda:
- Prodiamine
- Dithiopyr
- Pendimethalin
Follow up with a second application 6–8 weeks later for extended protection. Be sure to water in the pre-emergent to activate it.
Note: If you plan to overseed with ryegrass for winter color, skip pre-emergents or you’ll block rye germination.
6. Dealing with Weeds That Already Exist
If your Bermuda lawn already has weeds present, tackle them now before dormancy. Use a selective post-emergent herbicide labeled safe for Bermuda grass, and make sure daytime temperatures are still warm enough (above 60°F) for effective uptake.
Common options include:
- 2,4-D blends for broadleaf weeds
- MSMA alternatives for grassy weeds (check local regulations)
- Celsius or Certainty for mixed broadleaf and grassy weeds
Always read labels carefully and avoid herbicide use within 2–3 weeks of your last fertilizer application.
7. Core Aeration and Soil Health
If your Bermuda lawn has been compacted from summer use, aeration can still be done in early fall while the grass is actively growing. However, avoid aerating too late—once Bermuda is slowing down, you risk stress it can’t recover from before dormancy.
A better alternative at this stage is topdressing with compost or sand. A thin 1/4-inch layer of organic compost helps improve soil biology, retain nutrients, and prepare for spring green-up.
You may also consider adding soil amendments like gypsum (for clay soils) or lime (if your soil test indicates acidity). But always test before applying.
8. Overseeding with Ryegrass: Yes or No?
This is one of the most debated Bermuda lawn topics. Many homeowners overseed Bermuda with perennial ryegrass to maintain a green yard through winter. It looks great, but it comes with trade-offs:
Pros:
- Year-round green color
- Prevents muddy patches in winter
- Can reduce weed pressure
Cons:
- Competes with Bermuda in spring, slowing green-up
- Requires more mowing, fertilization, and water during winter
- Can weaken Bermuda if not managed properly
If you decide to overseed:
- Seed with perennial ryegrass at 5–10 lbs per 1,000 sq ft.
- Scalp Bermuda slightly shorter than normal before seeding.
- Keep the seedbed moist until germination (7–14 days).
- Fertilize lightly with a starter fertilizer high in phosphorus to encourage establishment.
If you prefer low maintenance and the healthiest Bermuda in spring, skip overseeding and stick to dormant Bermuda care.
9. Disease and Pest Prevention
Bermuda lawns can be vulnerable to diseases like spring dead spot, dollar spot, and large patch as temperatures cool. Preventative fungicide applications in fall can help protect your lawn through dormancy.
Tips:
- Apply fungicides such as azoxystrobin, propiconazole, or myclobutanil if you’ve had recurring issues.
- Follow label directions carefully and rotate fungicide classes to prevent resistance.
- Avoid overwatering or overfertilizing, as both promote disease activity.
As for pests, armyworms and grubs can still be active in fall. If you noticed summer infestations, treat with an insecticide before dormancy to avoid spring surprises.
10. Cleaning and Prepping Lawn Equipment
While not directly about the grass itself, fall is also the perfect time to take care of your lawn equipment:
- Sharpen and clean mower blades.
- Drain or stabilize fuel in mowers to avoid carburetor issues.
- Grease moving parts and store equipment properly.
- Check irrigation systems and winterize if necessary.
This ensures you’re ready to roll when spring green-up arrives.
11. Raking and Leaf Control
If your yard has trees, don’t let fallen leaves blanket your Bermuda lawn. A thick layer of leaves blocks sunlight, traps moisture, and encourages fungus.
- Rake or mulch leaves weekly until trees are bare.
- A mulching mower works great—shred leaves into fine pieces and return them to the soil as organic matter.
- Avoid heavy, wet piles that suffocate turf.
12. Long-Term Benefits of Proper Pre-Dormancy Care
Everything you do now impacts how your Bermuda lawn looks next year. Proper preparation gives you:
- Faster spring green-up
- Stronger root systems
- Reduced weed invasions
- Less disease pressure
- Better drought and cold resistance
Neglect, on the other hand, leads to weak, patchy, weed-filled lawns that require far more work and expense in spring.
Conclusion
As Bermuda grass prepares to go dormant, your goal should be to set it up for success next year. Shift your fertilization to potassium, adjust mowing height, apply pre-emergents, manage water correctly, deal with weeds and diseases, and decide whether overseeding makes sense for you. Add in some soil care, leaf control, and equipment prep, and you’ll be ahead of 90% of homeowners come spring.
Remember, lawn care is a year-round process. Every season builds on the next. The time you invest now, before dormancy, pays off with a lush, healthy Bermuda lawn when it wakes up again in the spring.
Key Takeaways
- Avoid late nitrogen, focus on potassium.
- Raise mowing height slightly before dormancy.
- Apply pre-emergents to block winter weeds.
- Water less often but deeply before first frost.
- Consider disease and pest prevention if you’ve had issues.
- Decide carefully on overseeding with ryegrass.
- Keep leaves and debris off your lawn.
- Prep your lawn equipment for storage.
Do these steps now, and your Bermuda lawn will thank you with a quick, strong comeback next year.
Have questions about Bermuda grass care or want product recommendations? Stay tuned for my upcoming guides on spring green-up, soil testing, and DIY lawn improvement projects. Together, we’ll keep your yard the envy of the neighborhood.