Two new wildfires sparked in northern Colorado on Sunday, one of which prompted mandatory evacuations and a disaster declaration from Gov. Jared Polis.

Crews are responding to a wildfire, dubbed the Fishhook Fire, burning on Rabbit Ears Pass near Steamboat Springs on Sunday.

Deadly and destructive wildfires erupt in the US each year, burning millions of acres and destroying thousands of homes. CNN is tracking the trends.

The Aspen Acres Fire continues to burn in Colorado days after it was first reported.

The Aspen Acres Fire continues to rage in Pueblo and Custer counties and saw vast growth on July 1, jumping from just over 28,000 acres on Wednesday morning to more than 50,000 acres Thursday afternoon.

The Aspen Acres Fire has burned nearly 67,000 acres and destroyed at least 180 structures as of the most recent update from fire officials. The fast-moving wildfire that began June 29 near the Aspen Acres campground in Custer County is now the ninth largest in Colorado history.

Wildfires spread rapidly through the western United States as dry regions experience historically dangerous conditions.

Conditions are expected to fluctuate throughout the day as winds and dry weather continue to drive wildfires statewide.