Four Mile Creek Weather -- Boulder, CO

Four Mile Creek Neighborhood Weather Overview

The Four Mile Creek neighborhood occupies a small canyon-mouth area in far west Boulder where Four Mile Canyon Creek exits the foothills, at approximately 5,500 feet elevation — among the highest in the Boulder city limits.

This neighborhood has a genuinely mountain microclimate: temperatures run 5–8°F cooler than downtown Boulder year-round, and the canyon funnel effect produces near-constant air movement that amplifies wind chill in winter. Snowfall is substantially higher than lower Boulder, with canyon-effect enhancement during northwest-flow storms.

The creek corridor creates a wildlife-rich riparian corridor; deer and foxes are common, and the willows and cottonwoods along the creek banks turn brilliant yellow in October. Flagstaff Mountain rises directly above, offering accessible hiking and one of the finest sunset-watching vantage points on the Front Range. Spring runoff from snowmelt can be significant from mid-March through late May.

Fire Risk and History

Four Mile Creek carries a high wildfire risk as one of Boulder's most fire-exposed residential areas. The 2010 Fourmile Canyon Fire originated in this drainage approximately three miles west of the neighborhood, burning east toward Boulder before being stopped at the foothills edge.

The neighborhood is within the wildland-urban interface zone and was under evacuation orders during that fire. Residents should maintain defensible space, participate in Boulder's FireWise program, and register for Boulder County emergency alerts at boco911.com.

Elevation and Microclimate

At 5,500 feet, Four Mile Creek experiences approximately 25 percent higher UV radiation than sea level.

The canyon orientation channels air drainage in evening hours, producing rapid temperature drops after sunset that can catch hikers unprepared. Afternoon thunderstorms along the foothills develop quickly and move through the canyon with little warning.

Flood Zone Information

The Four Mile Creek channel is classified FEMA Flood Zone AE (100-year floodplain) in some segments near the canyon mouth. Properties adjacent to the creek channel are at elevated flood risk during major precipitation events and spring snowmelt.

The September 2013 Boulder floods produced significant flows in Four Mile Creek, impacting the creek corridor well downstream. Properties set back from the creek are generally in Flood Zone X, but residents near the creek should verify their specific parcel designation at FEMA's Flood Map Service Center.