When can I stop mowing the lawn in the fall?

FAQ
Question: 

When can I stop mowing the lawn in the fall?

Answer: 

Continue to mow the lawn until the grass stops growing in the fall.  The foliage of cool-season grasses, such as Kentucky bluegrass, stops growing when daytime high temperatures are consistently below 50 degrees Fahrenheit.  In central Iowa, bluegrass usually stops growing in early to mid-November.  Once the foliage stops growing, the lawn mower can be put away for the winter.