State Route 299 is a California state highway that runs across Northern California, USA. It runs from Arcata on the Pacific Ocean to the border with Nevada. Between Arcata and Redding, Route 299 junctions with State Route 96 and is briefly co-signed with State Route 3. In Redding, it intersects with State Route 273, State Route 44 and a short section is co-signed with Interstate 5. East of Redding, it intersects with State Route 89 and a section is co-signed with State Route 139 before reaching Alturas. It is then co-signed with U.S. Highway 395 north-east of Alturas, then it runs east towards the border with Nevada.