Horse Autumn Grass and Seasonal Laminitis Risk

Autumn grass presents specific laminitis risks that many horse owners underestimate. Understanding seasonal patterns of sugar accumulation helps prevent unnecessary suffering.

Key Facts

Autumn grass can accumulate high levels of fructans and non-structural carbohydrates
The combination of cold nights and warm sunny days causes maximum sugar accumulation
Previously affected horses and native breeds face elevated risk throughout the autumn period
Frost causes grass to retain sugars that would normally be metabolized overnight
The laminitis risk is often highest when grass appears brown and stressed rather than lush

Welfare Considerations

Autumn laminitis is a preventable welfare emergency that claims many equine victims each year because owners do not anticipate risk from apparently dormant or frost-damaged grass. The counterintuitive reality that brown stressed grass can be more dangerous than lush green grass catches many owners by surprise. High-risk horses including those with previous laminitis, native breeds, and those with EMS or PPID need rigorous autumn grazing management. The consequences of inadequate management are severe laminitis attacks that cause intense suffering and may result in permanent structural damage or euthanasia.

What You Can Do

Restrict grazing for high-risk horses throughout the autumn period
Avoid turnout on frosted grass regardless of appearance
Monitor weather forecasts and increase restrictions during cold clear periods
Use grazing muzzles, track systems, or dry lots for high-risk horses in autumn
Continue monitoring for laminitis signs even when grass appears brown and unappealing
Discuss autumn management protocols with your vet for horses with metabolic conditions