How to mow a lawn correctly Worst time to mow Early morning, between 6 a.m. and 8 a.m. There will still be dew on the grass at this time. The wet dew makes your lawn mower work harder and causes clumps of wet grass to clog the mower and accumulate in your garden. You can mitigate this by doing a pass on your highest mower setting first then move down. Vary your mowing pattern To encourage stronger growth, less compaction of soil and a healthier lawn, change your mowing pattern with every cut. Th