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Tall Fescue prefers mowing to 3 inches in full sun, 3-1/2 to 4 inches in shade. When you mow Tall Fescue, your goal is to have the target height after having removed only 1/3rd of the grass with each mowing. So if your Tall Fescue lawn is in full sun, you should wait until it reaches 4-1/2 inches and remove 1-1/2 inches. If it's growing in shade, wait until the grass reaches about 5-1/2 inches, and remove about 1-3/4 to 2 inches. Keep your mower blade razor sharp!