What is Defensive Zone Start %?

The percentage of a player's shifts that begin in the defensive zone, where his team is defending.

What this tells us

When a player starts more shifts in the defensive zone, it usually means his coach is using him in a defensive role — often against top scorers or in tight games. A high DZS% can suppress offensive stats (fewer chances to score when you're defending), but it's also a sign of trust: your coach is asking you to handle tough situations. Context matters: a shutdown defenseman with 65% DZS% is doing his job; a power-play specialist with 65% DZS% is being misused.

Limitations

DZS% is pure context—it tells you where your coach *deploys* you, not how well you play. A player with high DZS% will naturally have fewer scoring chances, which can make his offensive numbers look worse even if he's elite at his actual job. It also shifts game-to-game based on score (trailing teams defend more), so comparing a player's DZS% in a 5-2 loss to a 5-2 win is misleading. That's why we also show Corsi and xG—they measure what you actually do in those situations, not just where you start.

How PuckLab calculates this

DZS% is calculated from shift-start locations in the PuckLab event database. Full methodology on /methodology page.

Example

A shutdown defenseman might log 70% DZS%, spending most of his ice time defending. A scoring winger typically sits around 35-40% DZS%, starting most shifts in the offensive zone where his team is attacking.