Only main roads in Pembrokeshire are being gritted in an attempt to save stocks as a fresh severe weather warning is issued for the county.
It has seen some fresh snow and the Met Office is warning of more to follow.
Some schools in the St David's area are closing and asking parents to collect their children.
The council said due to the high demand on stocks it was prioritising the distribution of salt and no longer gritting secondary and minor routes.
Icy road conditions are being reported across the county, with hotspots in the north and east, but all major routes are said to be clear.
A council spokesman said the "continuing uncertainty" over how long the current freezing weather would continue was a problem.
He said they would not be responding to requests for reactive gritting but those for any emergency responses would be prioritised as resources permit.
"The council apologises for any hardship this may cause but has been forced to ration salt supplies in order to preserve stocks," he added.
Ysgol Bro Dewi in St David's is closing and parents are asked to collect children.
Ysgol Dewi Sant secondary in St David's is also closing with buses being turned around to return pupils home.