What is Offensive Zone Start %?

The percentage of this player's shifts that start in the opponent's offensive zone rather than the neutral zone or their own zone.

What this tells us

When a player starts more shifts in the opponent's zone, he's getting an easier setup — his team has the puck and territorial advantage from the drop. A higher OZS% means the coach is favoring this player with better starting position, which inflates his possession numbers and shot rates. This is context you need when comparing possession stats between players: a 60% OZS% player's Corsi will look better partly because he's starting the shift closer to the net, not just because he's a better player.

Limitations

OZS% is a coaching decision, not a player skill. A talented player might get more offensive-zone starts because his coach trusts him in high-leverage spots—or he might get them because he's playing on a good team that spends more time in the opponent's zone overall. On its own, OZS% tells you about deployment, not about how well the player performs. That's why possession metrics like Corsi are almost always paired with zone-start context: a player with 55% Corsi and 60% OZS% is different from a player with 55% Corsi and 45% OZS%.

How PuckLab calculates this

PuckLab zone starts are assigned by shift-entry location (puck drop coordinates). Offensive zone is opponent's defensive zone. Shifts with no clear entry point (e.g., timeout restarts) are excluded from the denominator.

Example

A top-line forward on a strong team might see 55% offensive-zone starts, giving him easier entries and inflating his shot rates. A depth player on the same team might see 45% offensive-zone starts and have to earn possession the hard way.