Medford, OR – Residents in parts of southern Oregon should prepare for frost Monday morning as a cold air mass moves in behind a passing front.
According to the US National Weather Service Medford office, temperatures are expected to fall to frost-producing levels late Sunday night, September 21, into the morning of Monday, September 22. The coldest conditions will occur in northern Klamath County, particularly around Crescent and Chemult. Northern Lake County may also see near-freezing temperatures.
The forecast map shows overnight lows dipping into the 30s in higher-elevation valleys, where frost is most likely. Weather officials note that the frost threat will be limited to Monday morning, with temperatures gradually warming throughout the week.
Drivers in rural areas are advised to be cautious of slick spots, and gardeners are encouraged to cover sensitive plants to prevent damage.
The weather service added that this early-season frost is not unusual but serves as a reminder that cooler fall conditions are arriving across southern Oregon.
This frost risk ends after Monday morning, as warmer weather patterns are expected to return by midweek.
