The protest deadline is usually May 15 or 30 days after notice

If the county appraisal district sends a notice and the value, exemption, ownership, or property details look wrong, the protest clock matters.

The usual deadline is May 15 or 30 days after the appraisal district mailed the notice, whichever is later. Some special cases have different timing.

Save evidence early: sales, photos, repair estimates, engineering reports, flood evidence, builder documents, and comparable properties.