Precipitation peaks in march. Storms may produce water falls as well as flash floods. Colors in Zion Canyon usually peak in late October. Winters in Zion Canyon are fairly mild. Winter storms bring rain or light snow to Zion Canyon, but heavier snow to the higher elevations.
Winter storms can last several days and cause roads to be icy.
Zion roads are plowed, except teh Kolob Terrace road, which is closed in winter. be prepared for winter driving conditions from November through March.