Rest the lawn
Try to rest the lawn as much as possible during winter. If practical keep off when wet or frosty, as the grass plants are not actively growing and will not repair themselves if damaged until the spring.
Only mow the lawn if necessary; this will depend upon weather conditions and temperatures at the time. Do not mow if heavy frosts are expected or if the ground is very wet.
Clear leaves and debris
Use a light rake or brush to keep the lawn free of leaves and debris. Specialist leaf sweepers and lawn vacuums are available for hire from local garden centres or DIY stores for larger lawns; although in winter it is better to keep off with heavier machines.
Aerate consolidated areas of the lawn with a fork or with a spiking machine. These are available for hire from local garden centres or DIY stores for larger lawns. This will relieve compaction, improve drainage and allow more air into the root system leading to a healthier lawn.
Dealing with worms
Remember worms improve the nutrient content of a soil and are beneficial to the soil structure. Worm casts are best left to dry and then swept away with a stiff brush.
Service or replace your mower if necessary ready for the next growing season. As always make sure that the blades are in good condition and are sharp.