Take care of your mower after you mow for the last time this fall. Put it away after draining the gas and having any necessary repairs made, so it will be ready next spring.
Did you plant any fruit trees or roses earlier this year? If so, be sure to wrap hardware cloth around the base of them to keep rodents away.
Plant deciduous trees and shrubs this fall after the leaves have fallen.
Dig and store summer bulbs (like dahlias and gladiolus) after the first frost and store until next spring.