Chicago summers can put serious stress on lawns, especially cool season grass types.

Chicago summers can put serious stress on lawns, especially cool season grass types.
During heatwaves, it is normal for lawns to slow down growth or lose some color. In some cases, they enter dormancy to conserve energy.
The goal during extreme heat is not to force growth. It is to protect the lawn.
Deep, consistent watering helps maintain moisture below the surface, but overwatering can create additional stress.
Mowing height becomes more important. Cutting grass too short exposes it to more heat and weakens its ability to retain moisture.
Avoiding unnecessary stress during peak heat hours also makes a difference.
The biggest factor, however, is preparation. Lawns that were properly cared for in spring tend to handle summer stress much better.
Heat does not create problems. It exposes them.