The short answer: During Oklahoma’s growing season (April through October), weekly mowing keeps your lawn healthy by following the “1/3 rule”—never removing more than one-third of the grass blade at a time. When you wait two weeks between mows, you’re cutting off 50-75% of the blade, which shocks the grass, weakens the root system, and opens the door for weeds. However, if your lawn goes dormant during summer drought (because you don’t irrigate), biweekly mowing may work fine during those specific months. Complete Lawn Care has been serving Jenks, Tulsa, and Broken Arrow for over 25 years, and we’ve seen the difference proper mowing frequency makes—but we also know it’s not one-size-fits-all.
How Fast Does Grass Actually Grow in Oklahoma?
Understanding growth rates helps explain why mowing frequency matters.
Bermuda grass (most common in Jenks):
Optimal growth temperature: 75-95°F. Peak season growth rate (May-July): 1-2 inches per week. With irrigation and fertilization: up to 3 inches per week in ideal conditions.
Fescue grass:
Optimal growth temperature: 60-75°F. Spring and fall growth rate: 1-1.5 inches per week. Summer growth slows significantly due to heat stress.
What this means for mowing:
If grass grows 1.5-2 inches per week and you wait two weeks, you’re looking at 3-4 inches of growth to remove. If you maintain a 2.5-inch mowing height, that means cutting the grass from 5.5-6.5 inches down to 2.5 inches—removing more than half the blade in one pass.
The 1/3 Rule: Why It’s Not Just a Suggestion
The rule: Never remove more than one-third of the grass blade height in a single mowing.
This isn’t arbitrary—it’s plant biology. Here’s what happens inside the grass plant:
When you follow the 1/3 rule (weekly mowing):
The plant maintains enough leaf surface for photosynthesis. Energy production continues normally. Roots keep growing deeper (building drought resistance). The plant produces more tillers (side shoots), creating thicker turf. Stress stays minimal—the plant barely notices the trim.
When you violate the 1/3 rule (biweekly mowing during active growth):
The plant loses most of its photosynthesis capacity at once. It goes into survival mode, prioritizing blade regrowth over everything else. Root growth stops completely (all energy redirected to leaves). Tiller production decreases (thinner turf over time). The plant is stressed and vulnerable to disease, drought, and weed invasion.
The visible result: Brown or gray tips for 2-3 days after mowing (the “scalped” look), clumps of clippings the mower couldn’t mulch, and gradually thinning turf that invites weeds.
Weekly vs. Biweekly: What You’re Actually Trading Off
Let’s be honest about the trade-offs, because there ARE reasons people choose biweekly mowing.
Factor
Weekly Mowing
Biweekly Mowing
Lawn Appearance
Consistent, clean look all week
Scalped look for 2-3 days, overgrown look for 4-5 days
Turf Health
Deep roots, thick turf, weed resistant
Shallow roots, thinning turf, weed-prone
Clippings
Mulch easily, returning nutrients to soil.
Clump on surface, may need raking/bagging
Time Per Mow
45-60 minutes (easy cutting)
75-90 minutes (mower bogs, extra cleanup)
Annual Time
28 mows x 50 min = 23 hours
14 mows x 80 min = 19 hours
Long-Term Cost
Lower (healthy turf needs less intervention)
Higher (more weed treatments, possible renovation)
The honest takeaway: Biweekly mowing saves about 4 hours per year in direct mowing time. But it costs you in lawn quality and turf health and often creates more work down the road dealing with weeds and thin spots. Whether that trade-off makes sense depends entirely on your priorities.
The Clumping Problem: Why Long Grass Creates Extra Work
This is what frustrates biweekly mowers most.
When grass grows to 5-6 inches and you cut it to 2.5 inches, you’ve just removed 2.5-3.5 inches of grass blade. That’s a lot of plant material. Your mower can’t mulch that volume effectively, so clippings pile up in clumps on the lawn surface.
What happens to those clumps?
If you leave them: They smother the grass underneath, blocking light and trapping moisture. Within a week, you’ll have yellow or dead patches where clumps sat.
If you rake them, you’ve just added 20-30 minutes of work to your mowing routine—eliminating any time savings from mowing less frequently.
If you bag them: More work, plus you’re removing nutrients that would otherwise return to the soil. And now you have bags of clippings to dispose of.
With weekly mowing, you’re removing maybe 1 inch of growth. The mower mulches it effortlessly, clippings disappear into the turf, and nutrients return to the soil. No clumps, no raking, no bagging.
When Biweekly Mowing Actually Makes Sense in Oklahoma
We’re not going to pretend weekly mowing is always necessary. There are legitimate situations where biweekly works fine:
1. Summer drought dormancy (July-August)
If you don’t irrigate your lawn, Bermuda grass goes dormant when temperatures consistently hit 95°F+ and rainfall stops. Dormant grass doesn’t grow—so there’s nothing to mow. During these periods, you might mow every 2-3 weeks just to knock down the occasional weed. This is completely normal and doesn’t harm the lawn.
2. Early spring and late fall (shoulder seasons)
When soil temperatures are below 60°F, grass growth slows significantly. In March and November, biweekly mowing often works fine because the grass simply isn’t growing fast enough to violate the 1/3 rule.
3. Shaded areas with slow growth
Heavy shade reduces growth rate. If part of your lawn only gets 2-3 hours of sun, that section may do fine with less frequent mowing even when the rest of the lawn needs weekly attention.
The key: Match your mowing frequency to the actual growth rate—not an arbitrary schedule. During peak growth (May-June and September-October in Oklahoma), weekly mowing is almost always necessary. During slow growth periods, you can stretch it.
A Realistic Mowing Schedule for Jenks, Oklahoma
Here’s what a typical year looks like for an irrigated Bermuda lawn:
March: 1-2 mows (grass just waking up, slow growth)
April: Weekly mowing begins (growth accelerating).
May-June: Weekly mowing essential (peak growth period)
July-August: Weekly if irrigated; biweekly or less if the lawn is dormant
September-October: Weekly mowing (fall growth surge)
November: 1-2 mows (growth slowing, final cleanup)
December-February: No mowing (grass dormant)
Total: Approximately 28-32 mows per year for an irrigated lawn, or 18-22 mows for a non-irrigated lawn that goes dormant in summer.
Deciding What’s Right for Your Lawn
Rather than telling you what to do, here are the questions to ask yourself:
Do you water your lawn during dry periods? If yes, grass grows actively all summer and needs weekly mowing. If not, summer dormancy reduces mowing needs.
How much does lawn appearance matter to you? If curb appeal is important, weekly mowing delivers a consistently clean look. Biweekly creates an up-and-down appearance cycle.
Are you dealing with weed problems? Thick, healthy turf from proper mowing crowds out weeds naturally. Stressed, thin turf from infrequent mowing invites them in.
Would you rather spend time or money? DIY weekly mowing takes time but costs nothing extra. Hiring a professional costs money but frees your weekends.
What are your long-term goals for your property? If you plan to sell, curb appeal matters. If it’s a rental or temporary situation, minimum maintenance might make sense.
There’s no wrong answer—just trade-offs. The key is making an informed decision that matches your actual priorities.
How Complete Lawn Care Handles Mowing
Our weekly mowing service is designed around the 1/3 rule and Oklahoma’s growing conditions:
Proper mowing height: We adjust cutting height based on grass type and season. Bermuda at 2-2.5 inches, fescue at 3-4 inches.
Sharp blades: We sharpen blades regularly. Sharp blades cut clean; dull blades tear, creating brown tips and disease entry points.
Complete service: mowing, edging, trimming, and blowing—not just running a mower across the lawn.
Seasonal adjustments: We adapt frequency to actual conditions. If your lawn is dormant during drought, we don’t mow just to mow.
Combined with our 7-step lawn care program (fertilization and weed control), weekly mowing creates a complete system that keeps your lawn healthy year-round.
Ready to Reclaim Your Weekends?
If weekly mowing makes sense for your lawn goals but you’d rather not spend every Saturday behind a mower, Complete Lawn Care can help. We’ve been serving Jenks, Tulsa, Broken Arrow, Bixby, Owasso, and surrounding communities for over 25 years.
Contact us for a free estimate on weekly mowing service—and honest advice about whether professional service makes sense for your specific situation.
Phone: (918) 605-4646
Email: [email protected]
Online: completelawncaretulsa.com/get-a-quote
Proudly serving Tulsa, Broken Arrow, Jenks, Bixby, Owasso, Coweta, Sand Springs, Sapulpa, and surrounding Oklahoma communities.