A major wildfire known as the Thorn Fire remains the most significant active fire affecting San Diego County. The blaze ignited on July 15 near Buckthorn Trail in the community of Boulevard, east of San Diego, and rapidly spread due to extreme heat, dry vegetation, and gusty winds. The fire prompted evacuation orders, road closures, and a large emergency response from CAL FIRE and local agencies.
The Thorn Fire quickly grew after crossing Interstate 8, threatening homes and forcing residents in several evacuation zones to leave the area. Firefighters deployed ground crews, bulldozers, air tankers, and night-flying helicopters to slow the fire’s advance and protect nearby communities. The Golden Acorn Casino served as a temporary evacuation point for displaced residents during the height of the emergency.
Thanks to the extensive firefighting efforts, officials have reported significant progress in containing the wildfire. According to the latest CAL FIRE update, the Thorn Fire has burned approximately 1,234 acres and is now 100% contained. Evacuation orders and warnings have been lifted, and all previously closed sections of Interstate 8 have reopened to traffic. Crews continue to monitor the burn area and extinguish remaining hotspots to prevent flare-ups.
During the incident, the San Diego County Air Pollution Control District issued smoke advisories for communities including Live Oak Springs, Boulevard, Tierra Del Sol, and McCain Valley. Residents, particularly those with respiratory conditions, were advised to remain indoors when possible and limit outdoor activities until air quality improved.
Officials have not yet determined the cause of the Thorn Fire, and the investigation remains ongoing. Authorities continue to remind residents that Southern California is experiencing dangerous heat and elevated wildfire conditions, increasing the risk of new fire starts across the region.
Residents are encouraged to remain alert throughout the wildfire season and monitor official emergency alerts for the latest updates on fires, evacuation notices, and weather conditions. While the Thorn Fire is now fully contained, emergency officials urge the public to stay prepared as hot, dry weather continues to create favorable conditions for wildfire activity across San Diego County.