Your mowing height is probably one of the most important factors in maintaining a healthy lawn. Mowing grass short will cause the roots to not grow as deep which can cause it to burn out during periods of dry weather much easier than grass that is mowed long. Also you will notice a less robust grass plant when you mow short. Increasing the mowing height of your grass is an easy process and by increasing the mowing height you will be able to wait longer between mowings.
Refrain from mowing your grass for seven to 10 days to allow it to gain some height.
Read your lawn mower's operation manual to become familiar with how to adjust the cutting height of the lawn mower. Most likely the cutting height is adjusted at each wheel.
Locate the cutting height adjustment lever on each wheel. It will be latched on to a prong and moving this lever is how the cutting height is set. To raise the cutting height pull the lever away from the mower and slide it either right or left (direction will vary by mower) and release pressure to latch it on to another prong. Set each wheel at the same prong so the mower will cut your grass evenly.
Start your lawn mower and mow your lawn at the new height.