Remember that as the driver, you are responsible for ensuring that the vehicle has sufficient road grip, all year round.
What tread depth is required when?
The required tyre tread depth is different for summer and winter.
In winter, from 1 November to the first Sunday after Easter Monday inclusive, the required tread depth is at least 3 millimetres. The length of time this requirement applies will vary somewhat from year to year, depending on when Easter takes place.
In Nordland and Troms og Finnmark, the requirement for a tread depth of at least 3 mm applies from 16 October to 30 April inclusive.
In summer, which is to say outside of the time periods mentioned above, tyres are required to have a tread depth of at least 1.6 millimetres.
The vehicle must have winter tyres (studded or non-studded), chains or similar also outside of the periods mentioned above if this is necessary in order to ensure sufficient road grip.
When can you use studded tyres?
Studded tyres may only be used from 1 November to the first Sunday after Easter Monday inclusive. In Nordland and Troms og Finnmark, studded tyres may only be used from 16 October to 30 April inclusive.
If the weather and road surface conditions make it necessary, studded tyres and chains may be used beyond these dates. If you are using studded tyres, the vehicle must have studded tyres on all wheels.
When can you use non-studded winter tyres?
Non-studded winter tyres may be used all year round, but are not recommended for summer use because they may have a poorer road grip than summer tyres.
Tyre requirements for trailers
If you drive with a trailer, the same rules for tyre tread depth apply to the trailer as to the motor vehicle.