Santa Rosa is California's second largest island. Approximately 15 miles wide by 10 miles long; 84 square miles; 53,000 acres.
Santa Rosa Island is 26.5 miles from the nearest mainland, three miles east of San Miguel Island, and six miles west of Santa Cruz Island.
Average rainfall is 15 inches per year.
Five endemic plant species occur only on Santa Rosa Island.
Santa Rosa Island is home to only 3 native terrestrial mammals—the island fox, spotted skunk, and deer mouse. They are all endemic to the Channel Islands.
The gopher snake is the only species of snake on the island. Other reptiles and amphibians include the alligator lizard, western fence lizard, Pacific tree frog, and slender salamander.
Things To Do Things to do on Santa Rosa Island. more...
Hiking Santa Rosa Island Hiking Map and Guide more...
Did You Know?
Channel Islands National Park has more endangered species that only exist within this park than any other unit of the National Park Service. This means that survival of these plants and animals depends entirely on our ability to protect and restore the habitat of the five park islands.