Typically most people will cut the grass for the first time when the weather begins to get warmer, probably around March-April time when the grass really starts to grow.
The first cut of the grass growing season is also probably the most important too. People in the UK typically like a short, well-kept lawn, however many people cut the grass far too short on the first cut of the year.
When cutting the grass you should always follow the one third rule. Never cut more than a third of the blade of grass off in one go. Cutting more than this will stress the grass. Grass that turns yellow or brown can be a tell-tale sign that the grass may have been cut too short or overly stressed.
To achieve the length of grass you want you may need to cut your lawn over a number of weeks. Gradually decrease the cutting height of your lawnmower over a number of weeks until you reach the preferred grass height.
People in the UK generally cut their grass shorter than those living in mainland Europe. Shorter however, isn’t necessarily better and height of the grass should vary throughout the year.
Under normal UK weather conditions during March to June you may only need to cut the lawn once or twice a month.
When the weather gets warmer around July time, you may need to cut the grass once or twice a week to keep the grass the length you want it.
If you cut the lawn frequently and collect all the clippings, you may need to fertilise your lawn. By collecting the clippings each time you may inadvertently create a nitrogen deficient in the lawn, as the clippings are not able to breakdown and return to the lawn, adding all their lovely nutrients back in to the ground.
You will find that the frequency you cut the grass begins to decrease as the weather cools as your start to reach the autumn, around September/October time. These dates will vary depending on the climate and location each year.