The free guard zone rule in curling is a regulation that protects opponent stones positioned between the hog line and tee line (outside the house) from being removed from play during the first five stones of each end. If a delivered stone directly or indirectly causes an opponent’s guard to be knocked out during this protected period, the delivered stone is removed from play and all displaced stones are replaced to their original positions.
This rule fundamentally changed how curling is played when it was introduced in the early 1990s. Before the free guard zone existed, teams with the hammer (last stone advantage) could simply peel away any early guards, leading to conservative, defensive games with fewer scoring opportunities.
Understanding the free guard zone rule is essential for every curler, from beginners learning basic etiquette to competitive players developing complex strategies. The rule affects every decision made during the first half of each end and has transformed curling into the offensive, spectator-friendly sport we watch today.
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What Is the Free Guard Zone Rule in Curling?
The free guard zone (FGZ) is the area on a curling sheet between the hog line and the tee line at the playing end, excluding any stones that are touching or inside the house. During the first five stones delivered in an end, stones belonging to the opposition that come to rest in this zone are protected from being removed from play.
According to the World Curling Federation Rule 12 and Curling Canada rules, a stone is considered in the free guard zone if it lies entirely between the hog line and the tee line and is completely outside the house. Stones that are biting the house (touching the 12-foot ring) are NOT in the free guard zone and can be legally removed at any time.
The protection applies only to the first five stones delivered in an end. Once the fifth stone has been delivered and come to rest, the free guard zone protection ends. From the sixth stone onward, all stones in play are fair game and can be removed through normal hits, takeouts, and runbacks.
Zone Boundaries Explained
Visualizing the free guard zone requires understanding three key lines on a curling sheet. The hog line is located 21 feet from the center of each house. The tee line runs through the exact center of the house perpendicular to the center line. The house itself consists of concentric circles measuring 4 feet, 8 feet, and 12 feet in diameter.
The free guard zone spans the space between the hog line and tee line, but ONLY outside the outer 12-foot ring of the house. Any stone completely outside the 12-foot ring and between these two lines is in the free guard zone. Stones on the 12-foot ring or inside it are not considered guards and have no special protection.
History and Evolution: From 4-Rock to 5-Rock Rule
The free guard zone rule was invented in 1992 by curlers in Saskatchewan, Canada, who wanted to encourage more aggressive, offensive play. Before this innovation, the team with hammer could simply peel away any guards placed by the opposition, leading to boring defensive battles and frequent blank ends where neither team scored.
The original rule was called the 4-rock rule because it protected guards during the delivery of the first four stones of each end. This meant the leads for both teams could place guards with confidence, knowing the opposition could not simply blast them away. The rule was rapidly adopted across Canada and eventually by the World Curling Federation.
In 2026, most competitive curling uses the 5-rock rule, which extends protection through the fifth stone. This change was championed by Grand Slam of Curling events and officially adopted by the World Curling Federation for international competition starting with the 2018-2019 season. Curling Canada implemented the 5-rock rule for the 2018-2022 quadrennial.
Why the Rule Was Introduced
Curling in the 1980s had become dominated by defensive play. Teams with the hammer advantage would simply throw peel shots to remove any guards, then play for a blank end to maintain hammer into the next end. This strategy was effective but made for incredibly dull viewing and frustrated players who wanted to see more action.
The free guard zone rule forces teams to play around guards rather than simply removing them. This leads to more raised shots, runbacks, draws around guards, and complex strategic decisions. Games became more exciting for spectators while retaining the skill and precision that makes curling special.
How the 5-Rock Free Guard Zone Rule Works?
Under the current 5-rock rule, the first five stones delivered in each end are subject to free guard zone protection. This includes the lead’s two stones, the second’s two stones, and the first stone thrown by the third (or vice-skip). Once the fifth stone comes to rest, protection ends and the sixth stone can legally remove guards.
Counting stones correctly is essential. The count includes both teams’ deliveries alternately. First stone is red, second stone is yellow, third stone is red, fourth stone is yellow, fifth stone is red. If the red team has the hammer, they deliver the first and last stones of the end, meaning the fifth stone is always delivered by the team without hammer.
The protection is position-based, not team-based. Both teams have their guards protected during the first five stones. A red guard and a yellow guard in the free guard zone both have identical protection until the fifth stone is delivered.
4-Rock vs 5-Rock Rule Comparison
| Aspect | 4-Rock Rule | 5-Rock Rule |
|---|---|---|
| Stones Protected | First 4 stones | First 5 stones |
| Protection Ends | After 2nd’s 1st stone | After 3rd’s 1st stone |
| Guards Allowed | 2 per team protected | 3 per team protected |
| Adoption Date | 1992-2018 | 2018-present |
| Current Status | Some club play | Competitive/WCF standard |
The additional protected stone in the 5-rock rule gives teams without hammer one more opportunity to set up offensive position before the opposition can start peeling. This has led to even more aggressive play and higher scoring games at the elite level.
Free Guard Zone Violations and Remedies
When a violation of the free guard zone rule occurs, specific remedies must be applied according to official rules. If a delivered stone directly or indirectly causes an opponent’s stone in the free guard zone to be removed from play during the first five stones, that delivered stone is immediately removed from play.
All stones that were displaced by the violation are replaced to their original positions as determined by the skips or vice-skips. This includes any stones that were moved but remained in play, as well as the guard that was illegally removed. The delivered stone is removed regardless of whether it was the delivering team’s only stone remaining in play.
The key phrase is “removed from play.” A stone that simply moves but remains in the playing area is not considered removed from play. Only when a stone crosses the back line, touches the side line, or is knocked completely out of the playing surface does a violation occur.
Common Violation Scenarios
A direct hit on an opponent’s guard in the free guard zone during the first five stones is the most obvious violation. The delivered stone is removed and the guard is replaced. An indirect removal through a raise or double takeout also triggers the violation remedy.
Sometimes a stone is delivered, hits a guard, and then the guard hits another stone. If the guard itself is removed from play, that’s a violation. If only the second stone is removed while the guard stays in play, no violation has occurred.
Stones that are biting the house (touching the 12-foot ring) are NOT in the free guard zone. Hitting and removing these stones is perfectly legal at any time. Measuring may be required to determine if a stone is in the zone, which is why officials carry six-foot measuring sticks.
What You CAN Do in the Free Guard Zone?
Many curlers focus only on what is prohibited in the free guard zone, but understanding what IS allowed is equally important for developing strategy. You can legally move, touch, and reposition stones in the free guard zone in several ways.
Tick shots are legal and widely used in modern curling. A tick shot moves an opponent’s guard sideways without removing it from play. As long as the guard remains between the hog line and tee line outside the house, no violation occurs. Elite teams use ticks to reposition guards into less threatening positions while keeping them in play.
You can remove your OWN stones from the free guard zone at any time. The rule only protects opposition stones. If your own guard is blocking a shot you want to play, you can hit it and remove it legally even during the first five stones.
Double Takeouts and Complex Shots
Double takeouts are permitted when only one of the stones is in the free guard zone. If you hit a stone outside the zone and it removes a guarded stone in the zone, that’s legal. The delivered stone made contact with a stone not in the zone first.
You can also play shots that move a guard but don’t remove it from play. Hitting a guard and rolling it to a new position in the zone is completely legal. The rule only triggers when a stone crosses a boundary line and leaves the playing area entirely.
Rule Variations: No Tick Rule and Mixed Doubles
The no tick rule is a variation that some tournaments and clubs use in addition to the standard free guard zone rule. Under the no tick rule, you cannot even move an opponent’s guard in the free guard zone sideways. Any contact that changes the position of a protected guard is a violation.
The no tick rule is NOT part of standard Curling Canada or World Curling Federation rules. It is an optional addition that some competitive events use to further encourage offensive play. If you’re playing in a club league, always check whether the no tick rule applies to your competition.
Mixed Doubles Has No Free Guard Zone
Mixed doubles curling, the two-person format that debuted at the Olympics in 2018, does not use the free guard zone rule. This format has completely different strategic considerations and rules designed for faster play.
In mixed doubles, teams can place one stone before the first delivered stone, and the power play option allows positioning two stones. Without the free guard zone protection, teams can remove these positioned stones immediately. This creates a different style of play that rewards precision hitting from the very first stone.
How the Free Guard Zone Rule Changed Curling Strategy In 2026?
The free guard zone rule transformed curling from a defensive battle of attrition into an offensive showcase of skill and creativity. Teams can no longer simply peel away threats and play for blanks. They must navigate around guards, play complex raises and runbacks, and make difficult draws behind protection.
Before the rule, the team with hammer had a massive advantage because they controlled whether to score or blank. The free guard zone reduces this advantage by allowing the team without hammer to set up scoring opportunities that cannot be easily erased. Steals (scoring without hammer) became more common and exciting.
Blank ends have decreased dramatically since the rule’s introduction. A blank end occurs when no stones remain in the house when all sixteen have been delivered. With guards protected early, more stones remain in play, leading to scoring in more ends and closer, more dramatic finishes.
Modern Strategy Implications
The 5-rock extension has pushed strategy even further toward offense. Elite teams now regularly place three protected guards, creating crowded ice that demands incredible shot-making to navigate. The circus shot, a complex multi-stone raise or runback, has become more common as teams try to break up these clustered formations.
Teams without hammer now have real paths to score. The center guard has become a standard opening shot, giving the team without last stone a protected stone they can build around. This has made early ends more aggressive and entertaining for spectators.
Common Questions About the Free Guard Zone Rule
What is the free guard rule in curling?
The free guard zone rule protects opposition stones located between the hog line and tee line (outside the house) from being removed during the first five stones of an end. If a guard is knocked out during this protected period, the delivered stone is removed and all displaced stones are replaced to their original positions.
What is the 5 stone rule in curling?
The 5-stone rule means opposition stones in the free guard zone cannot be removed until after the fifth stone of the end has been delivered. This replaced the previous 4-stone rule in 2018-2019 to encourage more offensive play and give teams without hammer three protected stones instead of two.
Can you peel your own guards in the free guard zone?
Yes, you can remove your own stones from the free guard zone at any time. The rule only protects opposition stones. If your own guard is blocking a shot, you can legally hit and remove it even during the first five stones.
Is there free guard zone in mixed doubles curling?
No, mixed doubles curling does not use the free guard zone rule. This two-person format allows positioned stones to be removed immediately, creating different strategic dynamics than traditional four-person curling.
What happens if you accidentally remove a guard in the free guard zone?
If you violate the free guard zone rule during the first five stones, the delivered stone is removed from play and all displaced stones are replaced to their original positions. This includes replacing the guard that was illegally removed.
Can you play a double takeout if one stone is in the free guard zone?
Yes, double takeouts are allowed when only one stone is in the free guard zone. If the delivered stone hits a stone outside the zone first, and that stone removes a guarded stone, the shot is legal.
What is the no tick rule in curling?
The no tick rule is an optional variation that prevents moving an opponent’s guard sideways in the free guard zone. Unlike standard rules where tick shots are legal, the no tick rule prohibits any contact that changes a protected guard’s position. This is not part of standard WCF or Curling Canada rules.
Which leagues use 4-rock versus 5-rock rule?
Most competitive and international curling now uses the 5-rock rule. Some club leagues may still use the 4-rock rule. Grand Slam events and World Curling Federation competitions have used 5-rock since 2018-2019. Always check your local club’s rules before playing.
Conclusion: What Is the Free Guard Zone Rule in Curling
The free guard zone rule in curling is the regulation that protects opponent stones between the hog line and tee line from removal during the first five stones of an end. Introduced in 1992 and expanded to the 5-rock rule in 2018, this single change transformed curling from a defensive battle into the offensive, strategic sport millions enjoy watching today.
Understanding zone boundaries, violation remedies, and allowed shots like ticks will improve your appreciation of the game whether you’re a beginner or seasoned curler. The free guard zone rule ensures that leads and seconds can place guards with confidence, creating the complex situations that make curling exciting to play and watch. Check with your local club whether they use the 4-rock or 5-rock rule, and enjoy the strategic depth this rule adds to every end you play.