At approximately what distance from the runway should civil aircraft and certain military/cargo types be instructed to contact departure control?

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The situation tests when to hand off from the tower to departure control as aircraft begin their climb. For civil aircraft and certain military or cargo types, instructing them to contact departure control at approximately half a mile from the runway gives the departure controller enough lead time to begin sequencing, assign an initial altitude, and route the aircraft before it moves farther away from the airport. This point sits right at the edge of the tower’s immediate airspace, so the handoff happens early enough to manage traffic smoothly, yet not so far out that the aircraft isn’t yet in the appropriate radar coverage for departure control. Using a clear, close reference point helps pilots and controllers communicate efficiently and maintain safe separation as aircraft transition from the runway area to the en route structure.