Each year, lawns across Minnesota and Wisconsin go through periods where they simply do not receive enough rainfall. Sometimes it happens during a stretch of hot weather, while other times it slowly develops over weeks of limited precipitation. Sometimes it happens unexpectedly in May and other times as expected in August.
Grass constantly loses water through heat, sunlight, and normal plant activity. In order to stay healthy and continue growing, that water needs to be replaced through rainfall or irrigation. When it is not, the lawn begins slowing signs of drought stress.
The good news is that drought stress is common in cool season lawns and many lawns can recover very well once moisture returns.
What Happens to Grass During Drought Stress
When lawns do not receive enough water, grass plants begin conserving energy and moisture to survive. One of the first things homeowners notice is slower growth. The lawn may stop needing frequent mowing and begin changing color from green to a dull bluish gray. As drought stress increases, grass blades may fold or roll inward to reduce water loss. Eventually, parts of the lawn may turn tan or brown as the grass enters dormancy.
Dormancy is a natural survival mechanism that allows cool season grasses to survive dry periods. While brown grass may appear dead, many lawns are still alive beneath the surface waiting for water and cooler weather to return.
Signs Your Lawn Needs Water
Homeowners can often prevent severe drought stress by catching the early warning signs.
Common signs include:
• Footprints remaining visible after walking across the lawn
• Grass turning bluish gray
• Leaf blades folding or curling
• Slower growth and reduced mowing
• Dry or crunchy grass
• Brown areas developing in sunny locations
If these symptoms continue for extended periods, the lawn may begin entering dormancy.
Why Some Areas Dry Out Faster
One of the most frustrating parts of drought stress is that it rarely happens evenly across the lawn. Drought stress is commonly mistaken for application damage because lawns rarely dry out evenly, but this irregularity in look is typically a tell tale sign of something other than an application error. Areas near pavement, trees, slopes, and sunny locations usually show stress first.
Some areas naturally lose water faster than others.
- Along Roads, Sidewalks, and Driveways: Pavement absorbs and radiates heat, causing nearby turf to dry out faster. These areas also often contain poorer soil from construction, making drought stress even worse.
- Under Trees: Trees compete aggressively for water. Large root systems can remove significant moisture from the soil, often leaving grass underneath stressed during dry periods.
- Slopes and Hillsides: Water tends to run off slopes before it can soak deeply into the soil, causing hillsides to dry out much faster than flatter areas.
- Full Sun Areas: Sunny sections of the lawn lose moisture more quickly because heat and sunlight increase evaporation throughout the day.
How Long Does Recovery Take?
Recovery depends on how severe the drought stress became and how long it lasted. Mild drought stress may improve within a couple weeks once watering resumes. More severe drought damage can take months to fully recover and may sometimes require overseeding or repair work.
One important thing to understand is that recovery is gradual. Once water returns, the plant first focuses on rebuilding roots and energy reserves before visible top growth fully improves. Further the grass plant will grow new leaves from the crown, so it will take time to see a green, lush lawn again.
Patience is important.
What Homeowners Can Do
The most important step during drought stress is providing consistent moisture. In general, cool season lawns perform best when receiving about 1 to 1.5 inches of water per week between rainfall and irrigation.
Other helpful practices include:
• Watering deeply instead of lightly every day
• Watering early in the morning
• Raising mowing height during hot weather
• Reducing heavy traffic on stressed turf
• Monitoring sprinkler coverage for dry spots
How bioLawn Helps Reduce Drought Stress
At bioLawn, our bioBoost and bioBest programs are designed to help lawns build stronger root systems and improve stress tolerance. These programs focus on improving soil biology and encouraging deeper rooting. Deeper roots help grass access moisture farther down in the soil profile, reducing drought stress during hot and dry periods.
We also provide weekly lawn maintenance newsletters to existing customers. These newsletters forecast watering needs based on the current, local conditions to help you optimize water usage and stop drought before you see it.
While no lawn can completely avoid drought during extreme weather, but a solid plan can help minimize any drough impacts.
Final Thoughts
Drought stress is one of the most common lawn challenges in Minnesota and Wisconsin. While brown or thinning grass can be frustrating, understanding why it happens helps homeowners make better decisions about watering and lawn care.
Healthy lawns with deeper roots are naturally better equipped to handle dry conditions and recover once moisture returns.
If your lawn is struggling during hot or dry weather, bioLawn can help evaluate conditions and recommend the best path forward for recovery and long term lawn health.