Mow when the fescue grass grows to a maximum height of 4 1/2 inches before mowing it. If desired, you can also mow the fescue when it reaches 3 3/4 inches high. If you have just planted fescue seeds, wait until they reach 6 inches tall before mowing them for the first time.
Mow on a dry day, and put on closed toed shoes and pants. If you have allergies or breathing problems, it's also a good idea to wear a dust mask and glasses while mowing.
Set the mowing height on a lawn mower to between 2 1/2 to 3 inches high. If the fescue grass is growing in the shade, increase the mowing height to 3 1/2 inches.
Push the mower over the entire fescue lawn in side-by-side rows to cut it.
Repeat the cutting process once per week from spring through the fall when the fescue stops growing.