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How high should you mow your grass?

Well for some purists, they would say it's more a matter of mowing at the recommended height for your grass variety. They would be correct, but come on, isn't there some general rule of thumb we can use?

The answer is yes, there are some general guidelines:
Cool season grasses like Kentucky Blue Grass, Rye and Fescue are
recommended to be mowed high.
Warm season grasses like Bermuda are recommended to be cut low.

More Specifics:
Cool season grasses like Blue Grass, Fescue, and Rye should be mowed as high as possible. The best is around 2 to 3 inches (5 to 7.6 cm) and no higher. If you cut any taller than that, the grass can flop over, and if you cut it too short, thegrass is more susceptible to weeds, it dries out faster, and over all does poorly.

The last mow of the year can be around 3 inches (7.6 cm).

Warm season grasses like Bermuda should be cut around a height of 3/4 to 1 inch (1.9 to 2.5 cm) tall, which may require mowing one to three times per week.

Mowing at this height will encourage a dense, thriving turf that naturally blocks weeds. Healthy turf shades the soil so sunlight can't reach weed seeds ready to germinate, and a thick turf also minimizes the physical space available for weeds to become established.

If Bermuda is cut any taller than 1 inch (2.5 cm), it will be thinner and straggly looking which isn't what you want. A good healthy lawn of Bermuda should look like a big, green, dense mat.