Home » Regions » North America » Marine West Coast Forest » Coast Range

Coast Range

Page contents

To check where a specific point lies, you can look it up in our Ecoregion Locator.

Map Legend & Subregion List

This list will help you navigate the regions in case you have problems with viewing or clicking the interactive map above.

NameColor on MapEPA Code*
Coastal Lowlands1a
Coastal Uplands1b
Low Olympics1c
Willapa Hills1f
Mid-Coastal Sedimentary1g
Southern Oregon Coastal Mountains1h
Northern Franciscan Redwood Forest1i
King Range/Mattole Basin1j
Coastal Franciscan Redwood Forest1k
Fort Bragg/Fort Ross Terraces1l
Point Reyes/Farallon Islands1m
Santa Cruz Mountains1n
San Mateo Coastal Hills1o

* This code refers to the US EPA's Level 4 ecoregion codes for the continental U.S., see here.

About the Coast Range

The Coast Range is a Level III ecoregion of the U.S. located along the coast of western Washington state, Oregon, and northwest California. The region is narrower towards its southern end. It represents the southernmost portion of the Marine West Coast Forest in North America.

This region consists of low mountains, mostly covered by rich coniferous forests. The climate is moderate and rainfall is high. Although the northern part of this region is wet year-round, there is a seasonality of rainfall, with more falling in the winter, and as one moves south this seasonality becomes more pronounced, with significant periods of summer drought in the southernmost part of this region. Landslides and sliding debris are common.

Like much of the West Coast, the slope into the ocean is abrupt through much of the region. Although there are some coastal beaches and sand dunes, cliffs and steep descents into the sea are more common, and there are some marine terraces where a large, flat region that previously was at sea level has been raised above sea level.

At the southernmost end, this region borders the Central California Foothills and Coastal Mountains. Slightly north of this, inland to the east it is bordered by the Klamath Mountains/California High North Coast Range, and as one moves farther north, the Williamette Valley and then the Puget Lowland. Just inland from here, part of this region surrounds a small section of the North Cascades, a higher-altitude mountainous region.


1. Wiken, E., Griffith, G. "North American Terrestrial Ecoregions - Level III", Commission for Environmental Cooperation, (2011) Web.