The Met Office has issued a weather warning for snow and ice across all parts of Northern Ireland.
The yellow alert - meaning be aware and prepare for disruption - comes into force at 3pm on Thursday and lasts until noon on Friday.
Sleet and snow showers will become heavier and more frequent during Thursday afternoon, continuing overnight and well into Friday.
Icy stretches are also likely to form on untreated surfaces.
Forecasters are warning of possible travel disruptions.
"The showers are expected to fall as sleet or snow away from immediate northern coasts," said the chief forecaster.
"Shower activity will be enhanced at times by troughs of low pressure, which could allow several centimetres of snow to settle in a fairly short period."
Already on Thursday the icy conditions have caused disruption to some public services.