Check fructan risk
Is it safe to let your horse graze today?
What this page does
High fructan levels in grass can cause life-threatening laminitis and other metabolic diseases—not just in sensitive horses. Grassrisk assesses this risk daily for your location and displays it as a traffic light (green/yellow/red).
The result is guidance only and does not replace veterinary diagnosis or individual husbandry advice.
What Makes Grassrisk Unique
More than a weather app: a scientific model for fructan risk.
6-Day Lookback
Continuous hourly simulation instead of a snapshot – the fructan trajectory of recent days feeds into today's assessment.
Grass Growth Index
Shows how strongly the grass is growing and consuming fructan – information no other pasture app provides.
Photosynthesis Model
An hourly model balances sugar production and consumption from temperature, sun and soil moisture.
Scientific Weather Data
The model processes complex meteorological data – soil temperature, soil moisture and solar radiation at multiple depths – not just air temperature and rain.
7-Day Forecast
Plan grazing ahead: the traffic light shows the fructan risk not just for today, but for the next seven days.
Free & Ad-Free
The daily traffic light for your location is permanently free – available in over ten languages.