Are the rules the same in every state?

Mostly, but not entirely. States that play high school flag football under the NFHS Flag Football Rules Book can choose certain options by state association adoption, including:

• Field size: 300 x 120, 360 x 120, 360 x 160 or (new for 2026-27) 300 x 160 feet.
• Kicking: whether place kicks for field goals and tries are allowed (a field goal is worth 3 points where adopted), and whether a kicking tee may be used.
• Number of game officials, and whether goals and hash marks are used.
• Flag style and measurements, as long as flags meet the rules' minimum size.
• Instant replay in state postseason games only (new for 2026-27).

Your state high school association is the only source of binding rules interpretations for games involving its member schools.