The blog
Lawn care, with the weather data behind it.
When should you feed a cool-season lawn? Why the UK's rule doesn't work here
Turf Alert's UK feed threshold was applied to US lawns unchanged, then checked against real land-grant extension guidance — it was too low. Here's the real US number, and why.
Mow every 4 days or every 7? Why the answer depends on which US state you're in
One national mow interval broke badly for half the US cool-season zone. Real mowing-appointment data and a per-state backtest found out why, and fixed it.
How Turf Alert knows when your US lawn needs water
Not 'it hasn't rained in a while' — a running soil moisture deficit, checked against five real, named US droughts before we trusted it.
When does grass start growing across the US? What 11 cities of backtesting found
Checked against an independent US phenology dataset, 7 of 11 cities show a consistent pattern right away — and where 4 don't, the raw soil-temperature data explains exactly why.
5 real US droughts, reconstructed from nothing but soil physics
Ranking backtest years by drought-stress numbers alone surfaces five real, named US droughts across all 12 covered cities — the model was never told which years to look for.