A wildfire burning on Santa Rosa Island in California's Channel Islands National Park has grown to more than 16,942 acres and was only 26 percent contained as of Tuesday evening, May 19, after burning through the island's rare and irreplaceable Torrey pine grove — one of only two places in the world where the species grows naturally.

How the Fire Started

The fire was first reported by an aircraft flying overhead on Friday morning, May 16, after a 67-year-old mariner crashed his sailboat into the rocks at Santa Rosa Island late Thursday night. The U.S. Coast Guard reported that the sailor fired emergency flares to signal for help after running aground; those flares may have inadvertently ignited the blaze. The fire is classified as "human-caused" and remains under investigation.

The unidentified sailor spent the night stranded on the burning island but was uninjured. A Coast Guard aircrew rescued him the following morning and transported him to medical personnel at Camarillo Airport.

Rapid Growth and Damage

The fire exploded over the weekend, fueled by dry conditions, low humidity, and steady ocean winds. By Monday it had destroyed at least two historic structures and forced the evacuation of 11 National Park Service staff members by helicopter from their employee housing. By Tuesday evening it had scorched 16,942 acres — making it the largest fire ever recorded on Santa Rosa Island.

Officials confirmed Tuesday morning that the fire had moved through the Torrey pine grove on the eastern side of the island. "Grasses on the island continue to be receptive to fire with the dry winds, low humidity, and warm days," officials said in an InciWeb update. The full extent of damage to the grove — and to habitat supporting six rare and endangered plant species found exclusively on the island — is still being assessed.

Suppression Challenges

Fighting fire on a remote island roughly 40 miles offshore presents unique logistical challenges. The first firefighting crews were not boated out until Friday afternoon, approximately 10 hours after the fire was first reported, a gap that fire officials have not publicly explained. By Monday, roughly three dozen firefighters were on scene.

Suppression crews are focusing on defensible space preparation around the Main Ranch Complex, the Water Canyon area, and the South Point Lighthouse area on the western side of the island. Incident commanders have acknowledged the fire has potential to spread further toward Cherry Canyon.

Channel Islands Closure

Channel Islands National Park has closed Santa Rosa Island to visitors for the duration of the incident. No civilian evacuations have been ordered — the island has no permanent civilian residents — but the loss of the historic structures and potential destruction of the Torrey pine grove represent a significant cultural and ecological blow to the park.

The Santa Rosa Island Fire is being monitored on InciWeb at inciweb.wildfire.gov. While this fire is not in the Pacific Northwest, it is a stark reminder of the type of wind-driven fire behavior that can occur across the West during periods of low humidity, dry fuels, and gusty conditions — the same conditions now developing across Oregon, Washington, and Idaho.