When to Fertilize Your Lawn in Tulsa
Fertilize Bermuda grass from late April through early September. Fertilize fescue in early spring (March) and fall (September–November). Getting the timing right is the single biggest factor in lawn health — and the most common mistake Tulsa homeowners make.
Understanding Tulsa's Two Main Grass Types
Tulsa sits right in the transition zone where both warm-season and cool-season grasses thrive. The fertilization schedule that works perfectly for your neighbor's lawn might actually harm yours.
Bermuda Grass (Warm-Season)
Goes dormant and turns brown in winter, then greens up beautifully in late spring and summer. Handles Tulsa's heat well and recovers quickly from traffic.
Fescue (Cool-Season)
Stays green through winter but struggles during hot Tulsa summers. Grows most actively when Bermuda is slowing down — requiring a completely different fertilization schedule.
Bermuda Grass Fertilization Schedule
Total yearly nitrogen for Bermuda: 3 to 4 pounds per 1,000 square feet.
First Feeding
Timing: Late April to early May (when soil hits 65°F) Rate: 1 lb nitrogen per 1,000 sq ft Type: Slow-release
Second Feeding
Timing: Late May to early June Rate: 1 lb nitrogen per 1,000 sq ft Type: Slow- or quick-release
Third Feeding
Timing: Mid to late July Rate: 1 lb nitrogen per 1,000 sq ft Type: Slow-release
Fourth Feeding (Optional)
Timing: Late August to early September Rate: 0.5 to 1 lb nitrogen per 1,000 sq ft Type: Slow-release
Critical Rule: Never fertilize Bermuda grass before mid-April in Tulsa. Your Bermuda is still dormant, and that fertilizer will just feed weeds. Wait until you've mowed at least twice and nighttime temperatures consistently stay above 60°F.
Fescue Fertilization Schedule
Total yearly nitrogen for fescue: 3 to 4 pounds per 1,000 square feet.
Light Spring Feeding
Timing: Early to mid-March Rate: 0.5 to 1 lb nitrogen per 1,000 sq ft Type: Slow-release
Main Fall Feeding
Timing: Early to mid-September Rate: 1 lb nitrogen per 1,000 sq ft Type: Slow-release
Second Fall Feeding
Timing: Mid- to late October Rate: 1 lb nitrogen per 1,000 sq ft Type: Slow-release
Late Fall Feeding (Optional)
Timing: Late November Rate: 1 lb nitrogen per 1,000 sq ft Type: Slow-release
Why fall matters most: Fescue's root growth happens primarily in fall. Those September–November applications build a root system that helps your fescue survive next summer's heat. Keep spring fertilization lighter to avoid pushing too much top growth before summer stress hits.
Quick-Release vs. Slow-Release Fertilizers
Quick-Release
Nitrogen is immediately available. You'll see results in 3 to 5 days. However, it can burn your lawn if over-applied or applied during heat, and it only feeds for 2 to 4 weeks. Best for early spring on Bermuda if you want faster green-up.
Slow-Release
Feeds your lawn gradually over 6 to 8 weeks. Safer, requires fewer applications, and won't burn your lawn during Tulsa's unpredictable weather. One summer rainstorm won't wash away months of fertilizer. Recommended for at least 75% of your applications.
Common Fertilization Mistakes in Tulsa
Fertilizing Too Early
Fertilizing in February or March when Bermuda is still dormant wastes money and feeds winter weeds. Wait until your grass is actively growing.
Using the Same Schedule for All Grasses
Bermuda and fescue require completely different fertilization timing. What works for one can harm the other.
Fertilizing Before Heavy Rain
A heavy Oklahoma thunderstorm can wash away fertilizer before it does any good. Always check the forecast before applying.
Skipping Soil Testing
Your soil might already have plenty of phosphorus or potassium. A $30 soil test can save you hundreds in wasted fertilizer and create a healthier lawn.
Over-Fertilizing in Summer
More is not better during July and August heat. Over-fertilized lawns require more water, attract more pests, and actually become weaker.
Fertilizing Drought-Stressed Lawns
If your lawn is wilted or brown from lack of water, it needs water first — not fertilizer. Fix the water issue before applying any nutrients.
Soil Testing & Weather Considerations
Why Soil Testing Matters
Most Tulsa area soils are alkaline and may lack certain nutrients while having an excess of others. A proper soil test reveals your soil pH (Bermuda prefers 6.0–7.0; fescue prefers 5.5–6.5), existing nutrient levels, and exactly what your lawn actually needs. Without testing, you're guessing.
Adjusting for Oklahoma Weather
Late spring freeze: Hold off on fertilizing until after any freeze passes — fertilized grass is more susceptible to freeze damage. Heat waves: Skip scheduled applications during 100°+ stretches. Drought: Reduce fertilizer rates by half or skip entirely — fertilizer without adequate water causes more harm than good.
The Complete Lawn Care 7-Step Program
Serving Tulsa, Broken Arrow, Jenks, Bixby, Owasso, Sand Springs, and surrounding communities since 2000, Complete Lawn Care is a small family-owned business that treats every lawn like its own.
Pre-Emergent Applications
Prevent weeds before they start, timed precisely to Tulsa's seasons.
Properly Timed Fertilization
Fertilization based on your specific grass type using commercial-grade slow-release products not available at retail stores.
Weed Control & Soil Testing
Post-emergent weed control when needed, plus soil testing and pH adjustments tailored to your lawn.
Ongoing Expert Monitoring
Adjustments for Tulsa weather conditions and expert monitoring of your lawn's response throughout the season.
Ready to Take the Guesswork Out of Lawn Fertilization?
Let Complete Lawn Care handle the timing, products, and adjustments while you enjoy your weekends. 25 years of experience serving the Tulsa area. Located at 812 South 8th Street in Broken Arrow.
