When should you actually mow your lawn in the UK?

Search "when to mow your lawn UK" and you'll get some version of the same answer everywhere: start in March, go weekly through summer, taper off in autumn, stop for winter. It's not wrong, exactly. It's just the kind of advice that's true on average and useless in any specific year.

The problem with "March"

Some Marches, the grass is barely stirring. Other years it's already grown enough by mid-March to need cutting. The actual UK average first mow — measured properly, not guessed — is 19 March, based on the Woodland Trust's Nature's Calendar project: 34,000 real citizen-recorded first-cut dates going back to 2000. But an average across 25 years hides the part that actually matters to you: this year.

Grass doesn't care what the calendar says. It cares about soil temperature and day length. Some years those line up with the average. Plenty don't.

What actually decides it

Two things, mostly:

• Soil temperature, not air temperature — it's what actually drives root and shoot growth, and it lags behind the air by days or weeks depending on the season.
• Day length, which stops a random mild week in January from tricking a model (or a lawn) into thinking spring has arrived.

Turf Alert tracks both, every day, for your rough location, and works out how much your lawn has actually grown since its last cut — not how many days have passed since the last one, and not what a generic calendar says should happen this week.

So when should you mow?

Whenever the growth says so, not the calendar. That's the entire premise of this thing — see how the model itself has been checked against 86 years of real UK weather before we trusted it enough to build alerts on it.

If you'd rather just get told when it's actually time, sign up — it's free, and it's a handful of emails a year, not a subscription to nagging.