Grass will not be growing at this time of the year and the best treatment is to stay off it. Take especial care not to damage the grass by walking on it when the ground is frozen or waterlogged. Any areas of rough grass, such as an orchard or wild-flower meadow, can be mown if the weather is dry and fine.
Service your lawnmower either by using the manufacturer’s service manual, or take it to a service agent. Get several quotes if you can as prices vary greatly. Check blades, cables and all connections on electrical mowers and lawn tools.