When to Mow Your Lawn in Spring: The Right Cutting Height

However, timing and cutting height are what separate a lush lawn from needless strain and bare patches.

Mowing too early and too short slows growth at precisely the time when the lawn is building its strength. Starting the season wisely protects the roots, saves water and leaves the area more resilient to heat and foot traffic.

The one mistake that weakens a lawn

The most common error is cutting too soon and too low. As the lawn emerges from winter dormancy, it uses its leaf growth as an energy store. Removing it too severely weakens the roots and leaves the turf thin.

“Never remove more than one third of the current blade length in a single mow.”

An excessively low mower setting exposes the soil. Sunlight then dries it out more quickly. Weeds and moss fill the gaps because the grass cannot create a dense cover.

Why the spring start shapes the roots

In late winter, growth and metabolism are running at a low level. As temperatures rise, the lawn begins growing again, but this stage remains vulnerable. A few straightforward indicators provide useful guidance.

Reading temperature and soil signals correctly

• Consistently above 10 °C during the day: the grass begins growing visibly.
• Soil temperature of 6–7 °C: the roots start producing new growth.
• The lawn is 8–10 cm tall: there is enough leaf area for the first mow.
• The ground is neither frozen nor muddy: no wheel ruts or compaction.
• No overnight frost is forecast: freshly cut blade ends remain protected.

“First cutting height: leave 5–7 cm. This keeps the soil shaded and encourages deeper root growth.”

How to set the mower correctly

Start with the mower at its highest cutting setting. Over two to three mows, spaced a week apart, reduce the cutting height gradually so the lawn is not stressed.

Cutting heights that genuinely work

Situation	Grass height before mowing	Setting	Height after mowing
First cut in spring	8–10 cm	High	5–7 cm
Second cut (1–2 weeks later)	7–9 cm	Medium-high	5–6 cm
Regular mowing during dry spells	7–8 cm	Medium	5–6 cm
Heatwaves	8–10 cm	Medium-high	6–7 cm

Sharp blades, a clean cut

Blunt blades tear the grass rather than cutting it cleanly. The blade tips turn brown and lose moisture. Sharpening them at the start of each season prevents stress and reduces the demand on the motor.

“Before the first start, check: blades are sharp, cable or battery is in good condition, wheels move freely, and the grass collector is clean.”

Checklist for the first mow

A brief routine before the first use promotes dense growth and reduces repair work.

• Clear away leaves, branches and winter thatch so the blades can run freely.
• Plan mowing for late morning, once the dew has dried.
• Change the mowing direction each week to prevent flattened areas.
• Leave clippings behind as a thin mulch layer only when the cut is fine.
• Use the grass collector for coarse clippings or wet grass.

Mistakes that create bare patches

• Wet soil: the mower’s weight compacts it, leaving roots with less oxygen.
• Cutting too low first time: the balance for light shifts in favour of moss and weeds.
• Mowing immediately after frost: cell damage at the blade tips causes yellowing.
• Leaving long gaps between the first two cuts: the second cut becomes too severe again.
• Neglecting the edges: they grow tall, shade the rest of the lawn and encourage gaps.

Lawn care plan until June: less stress, more green

Give the lawn consistency rather than overzealous treatment during its first eight weeks. Mowing weekly at a moderate height keeps the turf dense. A restrained first feed using slow-release nitrogen supports establishment without causing rapid, weak growth. Water deeply but infrequently, only when the soil is dry and footprints remain visible.

A robotic mower needs a higher cutting profile in spring. Set it to its maximum height, then lower it only slightly after two weeks. Check its blades more often, as spring growth is more fibrous to cut.

Reading the lawn: three everyday tests

Simple checks can show whether the first cut is suitable.

• Footprint test: if an imprint remains visible for a long time, the soil lacks water or structure.
• Finger test: reach into the turf. If it feels cool and springy, the remaining height is right.
• Blade pattern: smooth cut ends show that the blade is working cleanly. Frayed ends indicate that sharpening is needed.

Bonus: when scarifying, liming and feeding make sense

Scarifying is useful only for thatchy lawns with steady growth. Choose a day when daytime temperatures are above 12 °C and rain is forecast within 24–48 hours. Cut the lawn down to 4–5 cm, scarify lightly, then apply a recovery fertiliser.

Lime should be applied only when the soil is too acidic. A soil test reveals the pH value. Applying it without testing risks over-liming and nutrient lock-up. For spring feeding, a balanced lawn fertiliser with a moderate nitrogen content and trace elements is sufficient.

Practical guide: from signal to action

Signal	Action
Above 10 °C by day, grass 8–10 cm	First mow, leaving a height of 5–7 cm
Soil is damp, not wet	Mowing is possible; avoid wheel ruts
Overnight frost is likely	Postpone mowing
Many brown tips	Sharpen the blades and raise the cutting height
Moss in partial shade	Mow higher, relieve compaction and improve light

“Those who begin spring with height, sharpness and patience will have a dense, hard-wearing lawn in summer that needs less water.”

Definition: mowing means the actual cut made by the machine, whereas mulching means finely shredding and leaving the clippings on the lawn. Mulch protects the soil from evaporation and releases nutrients slowly, as long as the layer remains extremely thin.

Practical example: if your lawn is 9 cm tall today and the forecast shows daytime temperatures of 12–15 °C with no frost, select the highest setting and cut to around 6 cm. Remove any visible clumps and inspect the cut tips the next day. If they remain clean, maintain this height for a week before carefully reducing it to 5–6 cm.