The Met Office has issued an amber weather warning and the public are advised to take extra care.
Accumulations of more than 5-10cm of snow will occur quite widely, with 15cm in some parts of the Amber area, falling within 3-6 hours.
The public are advised to avoid all non-essential journeys and be prepared for disruption, including altering travel plans.
Nicolas Breakspear Catholic School closed due to a gas leak discovered last night. The school hopes to open as normal on Monday.
Reports of an accident on the A414 between London Colney and Park Street.
Met Office forecasts more light snowfall in St Albans area over the weekend.