During summer heat, it is best to increase the deck height on your lawn mower. It is recommended, for Connecticut lawns, to mow at a height of 2.5-3 inches (from the ground) during the summer. Avoid removing more than a third of the grass height. This may require the lawn to be mowed more often, but will help encourage a healthier lawn. The heat of the summer cause grass growth to slow down. A tall, dense lawn helps keep the soil cool and moist during the summer. Tall grass will also help prevent your lawn from burning. A slight browning of the lawn is typical as it goes dormant to protect itself against extreme heat.