IHM Knowledge Center
What Is a Delayed Offside in Ice Hockey?
What is a delayed offside, how does the tag-up work, and when does the linesman stop play?
Editor: Coach Mark • Updated: February 23, 2026
Short Answer
A delayed offside is signaled when attacking players enter the offensive zone before the puck, but play continues until the attackers touch the puck while offside or fail to clear the zone to tag up.
Full Explanation
Offside is judged at the blue line. If an attacking player enters the offensive zone ahead of the puck, the linesman does not always stop play immediately. Instead, the official signals a delayed offside by raising an arm and allowing play to continue under strict conditions.
During delayed offside, the attacking team must clear the offensive zone. This means every attacker must skate back over the blue line so the team becomes onside again. This reset is commonly called a tag-up, because players must fully leave the zone before a legal re-entry can happen.
The defending team may attempt to gain control and exit the zone, but the key point is that the attacking team must not touch the puck inside the offensive zone while any attacker is still offside. If the puck is played by an attacker in the zone during the signal, the whistle comes immediately.
Once all attackers have cleared the zone, the delayed offside ends. The attacking team may then re-enter legally with a controlled entry, a dump-in timed correctly, or a regroup at the blue line.
Why Delayed Offside Exists
The delayed offside rule reduces unnecessary stoppages and keeps game flow high. Instead of whistling every early entry, the rule gives teams a chance to correct timing and continue play with structure, which supports modern transition hockey and faster pace.
Key Takeaways
- The linesman signals delayed offside with a raised arm.
- Attackers must clear the zone to tag up and reset onside.
- A whistle happens if an attacker touches the puck while still offside.
- Fast tag-ups help teams re-enter with control and keep tempo.