Various arrangements for hazard detector event tracking is presented. A system may include a hazard detector and a computer server system. Indications of events that occurred at the hazard detector may be provided to and stored by a computer server system. A user interface application executed on a mobile device may receive the indications of events that occurred at the hazard detector. A timeline may be generated that graphically represents the indications of events. The generated timeline may be output for presentation via a display of the mobile device.