How cold does it get during the winter months?
Question & Answer about Idaho
Updated June 11, 2026
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Idaho State Facts
State Flag
Idaho
Capital
Boise
State Bird
Mountain Bluebird
Statehood
July 3, 1890
State Flower
Syringa
Population
2.0 million (2020)
Answer
Winter temperatures in Idaho vary widely depending on the region but generally range from mild to very cold. In southern and lower elevation areas like Boise, average winter lows typically hover around 20 to 30 degrees Fahrenheit (-6 to -1 degrees Celsius). In contrast, northern and mountainous regions, including cities such as Coeur d'Alene and Sun Valley, often experience much colder conditions, with nighttime temperatures frequently dropping below 0 degrees Fahrenheit (-18 degrees Celsius).
Idaho's diverse geography, which includes the Rocky Mountains and high desert plains, greatly influences its winter climate. The higher elevations can see heavy snowfall and extended periods of subzero temperatures, especially in January and February, the coldest months. The state's cold winters support winter sports and activities, making places like Sun Valley popular ski destinations. Overall, Idaho winters are characterized by cold temperatures that can vary significantly based on location and elevation.
Key Points:
- Southern Idaho winters: lows around 20-30°F (-6 to -1°C)
- Northern and mountainous areas: often below 0°F (-18°C)
- Heavy snowfall common in high elevations
- Coldest months: January and February
Idaho's diverse geography, which includes the Rocky Mountains and high desert plains, greatly influences its winter climate. The higher elevations can see heavy snowfall and extended periods of subzero temperatures, especially in January and February, the coldest months. The state's cold winters support winter sports and activities, making places like Sun Valley popular ski destinations. Overall, Idaho winters are characterized by cold temperatures that can vary significantly based on location and elevation.
Key Points:
- Southern Idaho winters: lows around 20-30°F (-6 to -1°C)
- Northern and mountainous areas: often below 0°F (-18°C)
- Heavy snowfall common in high elevations
- Coldest months: January and February
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