Bus operator Anglian has cancelled all its services in Norfolk and Suffolk including school bus routes.
First Buses are operating only on main roads.
"Due to adverse weather conditions, and with worsening weather forecast:
There will be NO BUS SERVICES operated today.
We apologise for any inconvenience caused."
The RSPB is urging people to help birds this winter by putting out food and fresh water.
Feeding wild birds throughout winter is vital, but one Norfolk wildlife reserve owner has gone further by hand-feeding a tiny robin.
The MP for Colchester Sir Bob Russell has questioned widespread school closures because of the snow.