Alanna Radtke, 16, was last seen in Santa Rosa, California on February 23, 2026. The National Center for Missing & Exploited Children has issued an alert and lists her case as NCMEC Case #2078591. Authorities have not released specifics about the circumstances of her disappearance; the Santa Rosa Police Department is leading the investigation.

A public poster describes Alanna as a female now 16 years old and advises the public not to approach her if spotted but to contact law enforcement immediately. Anyone with information is asked to call the Santa Rosa Police Department at 528-5222 or NCMEC’s 24-hour hotline at 1-800-843-5678.

If anyone knew Alanna, saw her in Santa Rosa around February 23, 2026, or has information that could help locate her, please come forward to investigators.