Officials say the Roundabout Fire started Monday 20 miles northwest from Cedar City and was under zero percent containment by Tuesday afternoon.
No structures are endangered, but grazing lands near the Kern River Pipeline could be at risk.
The cause of the fire was under investigation.
The National Weather Service posted a Fire Weather Watch for low relative humidity and northwest winds 20-30 mph gusts to 40 mph which could adversely affect fire behavior.
---Information from: Utah Fire Information.