Swansea council is doubling the amount of road salt it keeps in stock after almost running out last winter.
The authority said it used 4,000 tonnes of grit at a cost of £160,000 - four times higher than the previous year.
It said it aimed to stock around 3,000 tonnes this year - twice at much as normal.
A report to councillors said it would have run out completely had neighbouring Neath Port Talbot council not supplied it with additional stocks.
"There was a grave shortage of rock salt last year," the report states.