The short answer: It depends entirely on your grass type. Bermuda and Zoysia (warm-season grasses) stop growing when soil temperatures drop below 55°F, which typically happens in late October to mid-November in the Tulsa area. They’ll stay dormant and brown until soil warms back up in late April or May. Fescue (cool-season grass) is the opposite—it slows dramatically in summer heat but keeps growing through fall and even winter, only truly stopping during the coldest weeks when temperatures stay below freezing. Understanding when your grass stops growing tells you when to stop mowing, when to adjust fertilization, and when to stop worrying about that brown lawn. Complete Lawn Care times our 7-step program around these natural growth cycles for each grass type.
Why Does Grass Stop Growing?
Grass growth is controlled primarily by temperature—specifically soil temperature, not just air temperature. When soil temperatures fall outside a grass type’s preferred range, growth slows and eventually stops. This isn’t the grass dying; it’s the grass going dormant to conserve energy and survive unfavorable conditions.
Think of dormancy like hibernation. The grass is alive but not actively growing. It’s waiting for conditions to improve before it invests energy in producing new leaf tissue.
The key factor is whether you have warm-season grass (Bermuda, Zoysia) or cool-season grass (Fescue). These two categories have completely opposite relationships with temperature.
When Bermuda and Zoysia Stop Growing in Oklahoma
Bermuda and Zoysia are warm-season grasses. They thrive in heat and go dormant in cold.
Growth stops when soil temperatures consistently drop below 55°F. In the Tulsa area, this typically happens in late October to mid-November, depending on the year.
Growth slows before that: You’ll notice growth slowing significantly in late September and October as temperatures cool. The grass isn’t dormant yet, but it’s not growing nearly as fast as it did in July.
What dormancy looks like: The grass turns tan or straw-colored. This is completely normal and healthy. The grass isn’t dead—it’s just not producing chlorophyll (the green pigment) because it’s not actively growing.
How long dormancy lasts: Typically late October/November through late April/May—roughly 5-6 months in Oklahoma. Bermuda is usually the last warm-season grass to green up in spring.
Growth resumes when soil temperatures consistently reach 65°F or higher. In Tulsa, this usually happens in late April to mid-May, though it varies by year. You’ll see green-up start in sunny areas first, while shaded spots stay brown longer.
Zoysia note: Zoysia tends to go dormant slightly earlier in fall and green up slightly later in spring than Bermuda. Expect about 2-3 extra weeks of brown lawn on each end of the season.
When Fescue Stops Growing in Oklahoma
Fescue is a cool-season grass with the opposite growth pattern. It struggles in heat and thrives in cooler temperatures.
Summer slowdown (not dormancy): Fescue dramatically slows its growth when temperatures exceed 85-90°F. During July and August in Oklahoma, fescue is essentially in survival mode—not growing much, just trying to stay alive. This is why fescue often looks thin and stressed in summer.
Fall surge: When temperatures cool in September, fescue kicks into its strongest growth period. Fall is prime time for fescue—this is when you should fertilize, overseed, and aerate.
Winter behavior: Unlike Bermuda, Fescue stays green through winter. Growth slows significantly when temperatures drop below 40°F and essentially stops during freezing weather, but fescue doesn’t go fully dormant the way warm-season grasses do. You may still need to mow occasionally during mild winter stretches.
Spring growth: Fescue resumes active growth in early spring (March-April) when temperatures are in the 60-75°F range. This is another strong growth period before summer heat arrives.
Key difference: Fescue gives you green grass in winter when Bermuda is brown, but it requires more water and careful management to survive Oklahoma summers. It’s a trade-off.
Growth Calendar: Bermuda vs. Fescue in Oklahoma
Month
Bermuda/Zoysia
Fescue
January
Dormant (brown)
Green, minimal growth
February
Dormant (brown)
Green, slow growth starting
March
Dormant, watching for green-up
Active growth
April
Beginning to green up
Active growth
May
Active growth starting
Growth slows as heat increases.
June
Peak growth
Stressed, minimal growth
July
Peak growth
Survival mode, heat stressed
August
Peak growth
Survival mode, heat stressed
September
Growth slowing
Peak growth, prime time
October
Slowing, approaching dormancy
Active growth
November
Dormant (brown)
Growth slowing
December
Dormant (brown)
Green, minimal growth
What This Means for Your Lawn Care Schedule
When to stop mowing
Bermuda/Zoysia: Stop mowing when the grass stops growing—typically late October to mid-November. There’s no need to mow dormant grass. You can do one final mow to clean things up before winter, but after that, put the mower away until spring green-up.
Fescue: You may need to mow occasionally all winter during mild stretches. Fescue doesn’t completely stop growing, so if it gets tall enough to need cutting, cut it. Maintain the same 3.5-4 inch height year-round.
When to stop fertilizing
Bermuda/Zoysia: The final fertilizer application should be in late summer (August-September) while the grass is still actively growing. Fertilizing dormant Bermuda is pointless—the grass can’t use the nutrients, and you’re just feeding winter weeds.
Fescue: Fall is actually prime fertilization time for fescue (September-November). A final winterizer application in late fall helps fescue develop strong roots for winter survival and early spring growth. Do NOT fertilize fescue in summer—it’s already stressed.
When to stop watering
Bermuda/Zoysia: Once dormant, these grasses need no supplemental watering. Turn off irrigation systems for winter (and make sure to winterize them to prevent frozen pipes). The grass is sleeping—it doesn’t need water.
Fescue: Fescue may need occasional watering during dry winter periods since it’s still alive and somewhat active. If you go several weeks without rain and the soil is dry, a light watering helps. Don’t overdo it—fescue needs far less water in winter than in summer.
When to apply pre-emergent
Pre-emergent herbicides work by preventing weed seeds from germinating. Timing is based on soil temperature, not grass growth. In Tulsa, spring pre-emergent (for crabgrass prevention) should go down in late February to early March when soil temps reach 55°F. Fall pre-emergent (for winter weeds) should be applied in September. This timing works for both warm-season and cool-season lawns.
Common Questions About Grass Growth and Dormancy
“My Bermuda is still brown in April—is it dead?”
Probably not. Bermudagrass is slow to green up in spring—it waits for consistent warm soil temperatures before breaking dormancy. Late April to mid-May green-up is normal in Oklahoma. If your neighbor’s Bermuda is green and yours isn’t, check whether they have more sun exposure (sunny areas green up first) or whether they’ve been watering to warm the soil. If your lawn is still completely brown by late May, then it’s worth investigating.
“Should I water dormant Bermuda to keep it green?”
No. Dormant Bermuda is brown because it’s not producing chlorophyll, not because it’s thirsty. No amount of water will make dormant grass turn green—dormancy is triggered by temperature, not moisture. Save your water bill and let the grass sleep.
“Why is my fescue brown in August?”
Fescue struggles in Oklahoma’s summer heat. Some browning and thinning during July and August is normal, especially in full-sun areas. Make sure you’re watering adequately (1.5-2 inches per week), mowing high (3.5-4 inches), and not fertilizing during summer. If browning is severe or patchy with defined borders, it could be brown patch disease rather than heat stress.
“Can I overseed Bermuda in fall like fescue?”
No. Bermuda should not be seeded in fall because it needs warm soil temperatures to germinate and establish before winter. Fall-seeded Bermuda won’t survive its first winter. Bermudagrass is best established in late spring or early summer when the soil is warm and it has a full growing season ahead.
“Why does my lawn have green spots and brown spots in winter?”
You probably have a mixed lawn—some Bermuda (brown and dormant) and some Fescue (green and active). This is common in Oklahoma. The green areas are fescue; the brown areas are Bermuda. It can look patchy in winter, but both grasses are healthy. The reverse happens in summer: Bermuda thrives while fescue struggles.
“Does dormant grass need any care?”
Minimal. The main concerns are controlling winter weeds (which can take over dormant Bermuda lawns) and applying pre-emergent in late winter to prevent spring weeds. Otherwise, dormant grass is low-maintenance. No mowing, no watering, no fertilizing. This is one reason Bermuda is popular—it basically takes care of itself for 5-6 months.
Why Understanding Growth Cycles Matters
The biggest lawn care mistakes happen when homeowners treat grass the same way year-round, or worse, treat fescue like Bermuda (or vice versa).
Common mistakes:
Fertilizing fescue in summer (stresses already-struggling grass and promotes disease). Fertilizing dormant Bermuda in winter (wastes money and feeds weeds). Watering dormant Bermuda (accomplishes nothing). Not watering Fescue in summer (kills it). Overseeding Bermuda in fall (seedlings won’t survive winter). Scalping fescue in summer severely stresses the grass.
Complete Lawn Care’s 7-step program is designed around these natural growth cycles. We fertilize Bermuda when it’s actively growing and can use the nutrients. We fertilize fescue in fall and spring when it’s in its prime growth periods. We time pre-emergent applications for when they’ll actually prevent weed germination. We adjust our approach based on your specific grass type—because what helps one grass can hurt the other.
The Bottom Line
Bermudagrass and Zoysia stop growing in late October to mid-November when soil temperatures drop below 55°F. They stay dormant (brown) until late April or May.
Fescue slows dramatically in summer heat but keeps growing through fall and winter, only stopping during the coldest freezing periods.
Dormancy is normal and healthy—brown grass isn’t dead grass. It’s conserving energy for the next growing season.
Lawn care should match the growth cycle: Fertilize, water, and maintain your lawn when it’s actively growing. Let it rest when it’s dormant.
Not Sure What Your Lawn Needs Right Now?
Complete Lawn Care’s 7-step program is designed around Oklahoma’s grass growth cycles. We know when Bermuda needs fertilizer and when Fescue needs rest. We time applications based on soil temperature and grass type—not a generic calendar that ignores local conditions.
If you’re not sure what grass type you have, when it should be growing, or what care it needs right now, we’re happy to help. Soil testing can also reveal underlying issues that affect growth regardless of the season.
We’ve been working with Tulsa-area lawns for over 25 years—we understand local conditions and how to work with them, not against them.
Phone: (918) 605-4646
Email: [email protected]
Online: completelawncaretulsa.com/get-a-quote
Proudly serving Tulsa, Broken Arrow, Owasso, Jenks, Bixby, Sand Springs, and surrounding Oklahoma communities since 2000.