The First Cut: When and How to Mow Your Lawn After Winter

As winter fades and the first signs of spring appear, homeowners begin turning their attention to their lawns. A key question at this time of year is: when is the right time for the first mow of the season? Timing it correctly can promote healthy growth, but getting it wrong can lead to soil compaction, weak roots and increased vulnerability to weeds. Peter Chaloner, Managing Director of Cobra lawnmowers, shares his expert advice on when and how to make the crucial first cut. 

Timing the first mow 

The ideal time for the first mow of the year depends on both weather conditions and grass growth rather than the calendar. While mid to late March is generally recommended, the timing should be based on environmental factors. Grass growth typically resumes when temperatures reach around 6°C, as soil begins to warm and root activity increases.  

While an early warm spell might tempt gardeners to get the mower out, patience is key. Cutting too soon – especially when the soil is still wet or after a late frost, can lead to soil compaction, weakened grass and hindered regrowth. It's best to wait for a few consecutive dry days, particularly for lawns on heavy clay soil, to allow the ground to firm up. Mowing wet grass can lead to clumping, an uneven cut, and potential mower damage. For best results, mowing should be done later in the day, once any frost has thawed or dew has evaporated, to ensure a cleaner cut and promote healthier growth. 

Best practices for cutting grass after winter 

A cautious approach should be taken when making the first cut of the season. Many gardeners make the mistake of cutting too much too soon, which can place stress on the lawn, leading to shallow roots and making it more vulnerable to drought and disease. The golden rule is to remove no more than one-third of the grass height. In the following weeks, the cutting height can be gradually reduced to achieve a neater finish without damaging the lawn. 

Choosing the right mower is just as important as mowing technique. A high-quality machine, such as the Cobra M41C Lawnmower, provides adjustable cutting heights, allowing for a gentle initial mow before progressively reducing the height as the season progresses. Using sharp blades is essential, as dull blades can tear grass rather than cutting it evenly, making it more vulnerable to disease. If a mower has not been serviced since the previous season, now is the time to check the blade and sharpen or replace it if needed. 

Preparing for the first cut 

Before mowing, take a few moments to prepare the lawn. Clearing away fallen leaves, twigs and moss will prevent the mower from clogging and ensure an even cut. 

It's also important to check for any winter damage, such as dead patches or signs of disease. If bare spots are visible, these can be overseeded after the first mow, once the soil has warmed up, to help promote even growth. Lightly rake the lawn to remove surface debris and lift matted grass, improving airflow and encouraging healthier shoots. For lawns with excessive thatch build-up, a light scarification can improve water and nutrient absorption. If the lawn has become compacted over winter, aeration will help improve drainage and encourage stronger root growth. 

To explore Cobra’s full range of machinery, visit www.cobragarden.co.uk. 

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Editors notes

The Cobra Garden range is constantly expanding and now consists of over 130 products to cover both domestic and professional requirements. Cobra incorporate a comprehensive range of petrol, electric and cordless lawnmowers, handheld machines and lawncare products.