The work schedule in cooler months makes Spring and Summer work pleasurable. For me, this schedule starts when the night temperatures drop into the 50s. In most of Alabama, Ryegrass (Lolium) will germinate once night temperatures are consistently in the 50s. If you are not in Alabama, wait for a 20 degree temperature spread from day to night. Over seeding with Ryegrass keeps our grass green through the cooler months and the deer keep it mowed for us.
This also starts the most successful time of year for transplanting trees and bushes. Winter vegetable plantings should be in by now.
This is also a good time for preventative equipment maintenance. Consider:
Replace oil, fuel and air filters.
Change and properly dispose of used oil.
Check fluid levels and add when necessary.
Inspect or replace spark plugs (and adjust gap).
Lube grease fittings.
Where possible, hand turn bearings and spindles and replace when necessary.
Check belts and replace where necessary.
Check blades and sharpen or replace as necessary.
Check tire pressure (do this after every major temperature change).
Replace broken items discovered during these inspections.
Add items from your unique user manuals.