Haven't been in business for a full season yet so take it with a grain of salt.
Spring- cleanups and early mowing, planting, mulch, light hardscaping
Summer- Mostly mowing with as much mulch and light hardscaping as I can get
Fall- Aeration, cleanup, final mows, gutter cleaning
Eventually I will plow in the winter but with my work schedule I can't commit to it yet. Pruning and trimming takes place throughout the year as different plants require pruning at different times of the year.