Trailer winter tyres – what rules apply?
Whether a trailer must be fitted with winter tyres depends on the country. In many European countries, winter tyre requirements apply primarily to the towing vehicle rather than the trailer itself. However, fitting winter tyres to the trailer as well can significantly improve safety in cold and slippery conditions. Rules vary by country – always check the regulations that apply in your region.
Does a trailer need winter tyres?
In most countries, there is no legal requirement for trailers to have winter tyres – the obligation typically applies to the towing vehicle. That said, fitting appropriate tyres to the trailer is strongly recommended when driving in snow, ice, or low temperatures. A trailer on summer tyres can behave unpredictably on a slippery surface, even when the towing vehicle is properly equipped. Always verify what is required in your country and in any country you plan to drive through.
When are winter tyres on a trailer recommended?
Winter tyres on a trailer are beneficial whenever road conditions involve snow, ice, or temperatures consistently below around 7°C. At these temperatures, summer tyre rubber hardens and loses grip. Winter tyres improve traction and stability, help the trailer follow the towing vehicle more predictably, and reduce the risk of the trailer pushing or swaying during braking.
Are all-season tyres permitted on trailers?
Yes, all-season tyres are generally permitted on trailers. For use in winter conditions, they should carry the Alpine symbol (three-peak mountain with snowflake) to confirm they meet the minimum standard for winter performance. Check that the tyres are appropriate for the trailer’s load rating and axle capacity.
What tyre markings should you look for?
Winter tyres and suitable all-season tyres should carry the Alpine symbol – a snowflake inside a three-peaked mountain outline. This marking indicates the tyre has been tested and approved for winter road conditions. Tyres marked only with an M+S designation without the Alpine symbol do not meet the same standard and may not be accepted as winter tyres in all countries.
What is the minimum legal tread depth for trailer tyres?
The legal minimum tread depth across most of Europe is 1.6 mm. For winter conditions, a significantly greater tread depth is recommended to ensure adequate grip – many experts suggest replacing tyres before they reach 3–4 mm in winter use. Check tyre condition carefully before the winter season and replace any tyres that are cracked, damaged, or worn unevenly.
What are the risks of using summer tyres on a trailer in winter?
On snow or ice, a trailer on summer tyres can slide sideways, resist braking, or cause the combination to become unstable – particularly in corners or during emergency stops. These risks increase further if tyre pressure is incorrect or the load is unevenly distributed. See the guide on trailer tyre pressure for guidance on correct pressure settings.
What else should you check before towing in winter?
Before any winter journey, check the following:
– Tyre condition, tread depth, and pressure on all wheels including any spare
– Brake function and adjustment – see how to adjust trailer brakes
– All trailer lighting working correctly – visibility is reduced in winter conditions
– Load distribution – correct weight balance is especially important on slippery roads; see trailer axle load
Summary
Winter tyre requirements for trailers vary by country and in many places apply only to the towing vehicle. However, fitting winter or all-season tyres with the Alpine symbol to your trailer is strongly recommended for safe towing in cold and slippery conditions. Always check local regulations, inspect tyre condition before winter, and ensure the rest of the trailer is in good working order before setting off.