Question:
What should I know about Southern Idaho winters before I move?
Answer:
They’re probably milder than you're expecting — but winters still have some bite.
In the Treasure Valley, winter is typically more manageable than many people imagine. Daytime temperatures in December and January are usually in the upper 30s, with overnight lows in the low to mid 20s, occasionally dropping into single digits on the odd night. Snow happens, but on the valley floor it's often measured in inches rather than feet, and it usually melts between storms.
That doesn't mean every winter is the same. Some years (like 2025-26) are remarkably mild. Others bring stretches of snow, ice, and colder temperatures. The winter of 2016-17 was a notable outlier, with unusually heavy snowfall that disrupted travel and daily life across the valley.
One thing newcomers often notice more than the snow is the occasional winter inversion, when a layer of clouds and fog settles into the valley for days at a time.
For many people, the tradeoff works well: you can enjoy skiing, snowboarding, snowshoeing, and mountain scenery less than an hour away, while avoiding the long, severe winters common in many other parts of the country.