Strictly speaking, spring is the best time to scarify. However, there is a danger that you will have to endure beautiful summer weather with a lawn that's not looking its best and is still growing back.
How many times a year should you scarify your lawn?
Other factors such as bacterial activity in the soil and how the lawn is mowed can make a difference to how quickly thatch builds up. As a general rule we would advise scarification at least every other year.
When should I scarify my lawn UK?
SEPTEMBER OR OCTOBER – AUTUMN IS THE BEST TIME TO SCARIFY YOUR LAWN. In September and October the soil is still warm, the air temperature cools and the moisture levels generally rise.