Fall is the most beneficial time to fertilize your lawn.
Temperatures between 58–65 degrees are optimal for root growth and slows top growth. Fertilizing at this time will promote the roots to store more energy, benefitting the grass as it comes out of dormancy in the spring.
Another factor to consider is reducing water.
Avoid using the “set and forget” method of watering. Become familiar with your irrigation controllers and make the appropriate and frequent adjustments to limit overwatering and expensive water bills. Water usage should be reduced significantly in the fall. A good rule of thumb is to water deeply and infrequently to promote good root growth.
Early fall is also a great time to aerate your lawn.
It is best to avoid aeration in the summer as the turf is already stressed from the heat. When temperatures begin to decline, aeration provides a great opportunity to reduce compaction and allow more oxygen into the soil. If the turf grass is thin or in need of repair, over seeding the lawn after aeration will help with seed germination.