OB
OB (out of bounds) refers to any area outside the boundary edge of a golf course, where play is not allowed. A ball is out of bounds only when all of it lies past that boundary.
What is out of bounds (OB) in golf?
Out of bounds is the area beyond the edge of the course where a player is not permitted to play. When a shot finishes there, the ball is dead, and the golfer cannot play it from where it lies. OB is almost always land the course does not control or want golfers walking through: neighbouring property, a road, a car park, or a section of the grounds set aside as off limits.
The abbreviation turns up on scorecards and in conversation as “OB”, “O.B.”, or occasionally “O.O.B.” All three mean the same thing. Under the Rules of Golf, written jointly by the USGA and The R&A, out of bounds is defined in Rule 18.2, and the penalty for finding it is the steepest that applies to a normal errant shot.
What makes OB different from other trouble on the course is that a player can neither play out of it nor take free relief. A pond or a stretch of tall grass still sits inside the course. A ball beyond the white stakes does not. That single distinction shapes every rule that follows.
How out of bounds is marked
Courses define OB with white stakes, white painted lines, or a physical boundary such as a fence or wall. The scorecard or the local rules confirm which method is in use on a given hole.
Where stakes mark the edge, the boundary runs along the line between their course-side points at ground level. A painted white line works a little differently: the line itself is out of bounds, and only its course-side edge counts as the true boundary. Fences and walls are simplest. The boundary sits at the course-side face of the posts or the structure.
A ball is out of bounds only when all of it sits past the boundary edge. If any part of the ball touches the ground on the course side, or hangs in the air above it, the ball stays in play. So a ball resting mostly on a white line with a sliver still inside is, under the rules, in bounds.
White boundary stakes count as fixed objects, even the ones that lift out of the ground easily. A player cannot pull a white stake aside to make a swing easier, which is a difference worth knowing before reaching for one.
The penalty for hitting out of bounds
OB carries a stroke-and-distance penalty under Rule 18.2. The player adds one penalty stroke and plays again from the spot of the previous shot. Both parts of that phrase matter: a stroke is added, and the distance gained by the original shot is handed back. A drive that sails OB means the next ball is played from the tee again, now counting as the third shot.
Golfers often call this the harshest penalty in the game, and the loss of distance is why. A ball in a penalty area costs one stroke but lets the player move forward. Out of bounds is different. It costs a stroke and hands back every yard the shot gained.
Two things soften the blow in casual play. A provisional ball, played under Rule 18.3 before walking forward, saves the trek back if the first ball turns out to be gone; the player announces the intention to play a provisional and hits again. Many courses also adopt a Model Local Rule that lets a player drop near where the ball went out for a two-stroke penalty instead of returning to the previous spot. That local rule suits everyday play rather than serious competition, and it applies only where the course has put it in effect.
Out of bounds vs a penalty area
Most confusion about OB comes from mixing it up with a penalty area, which is marked by red or yellow stakes rather than white. The two look similar from the fairway but follow different rules.
| Out of bounds (white) | Penalty area (red / yellow) | |
| Marked by | White stakes or lines, fences, walls | Red or yellow stakes or lines |
| Governing rule | Rule 18.2 | Rule 17 |
| Can you play the ball? | No, the ball is out of play | Yes, if it is findable and playable |
| Penalty | One stroke, stroke-and-distance | One stroke |
| Do you lose distance? | Yes, replay from the previous spot | No, relief lets you move forward |
| Can you move the stakes? | No, they are boundary objects | Usually yes, they are movable |
The practical difference is that red and yellow give a golfer options, while white gives almost none. A ball in a red penalty area can often be played as it lies or dropped nearby. A ball beyond the white stakes is simply out of the hole.
Common misconceptions
A few ideas about OB trip up newer players again and again.
The first is that a ball touching a white line or stake is out of bounds. It is not. The whole ball has to be past the boundary edge, so any part touching the course side keeps it in play.
The second is that a ball can be played from just outside the stakes if it happens to be sitting cleanly. It cannot. Once a ball is out of bounds it is out of play, and hitting it anyway brings a penalty for playing from a wrong place.
The third is that white stakes can be moved like the red and yellow ones. A golfer who removes a white stake to clear a swing has broken a rule, because white stakes are boundary objects rather than movable markers.
Related Golf Terms
- Pin seeker — Slang for a shot tracking straight at the flag.
- Ground game — Slang for playing low, running shots along the ground.
- Robbed — Slang for a putt that lips out after looking certain to drop.
- Tips — Slang for the back tees, the longest setup on a course.
- Dime — Slang for a shot that finishes very close to the pin.
Frequently Asked Questions
What does OB stand for in golf?
OB stands for out of bounds, the area outside the course boundary where play is not allowed.
Is hitting OB a one-stroke or two-stroke penalty?
Under the standard rule it is stroke-and-distance: one penalty stroke plus replaying from the previous spot. A course may offer a two-stroke drop as a local rule.
Can a player ever play a ball that is out of bounds?
No. A ball out of bounds is out of play and must not be struck, even if it sits in a good lie.
What colour stakes mean out of bounds?
White stakes and white lines mark out of bounds. Red and yellow stakes mean something else entirely: a penalty area, which comes with its own, more forgiving set of options.
How does OB differ from a lost ball?
The procedure is the same, stroke-and-distance, but a lost ball is one that cannot be found within the three-minute search time, while an OB ball has crossed the course boundary.
Sources
- The R&A. “Rule 18: Stroke-and-Distance Relief; Ball Lost or Out of Bounds; Provisional Ball.” Accessed July 2026.
https://www.randa.org/en/rog/the-rules-of-golf/rule-18 - USGA. “Rule 18 – Stroke-and-Distance Relief; Ball Lost or Out of Bounds; Provisional Ball.” Accessed July 2026.
https://www.usga.org/content/usga/home-page/custom-search-pages/rules/2019-golf-rules-and-interpretations/pe-rule-18.html - USGA. “Golf’s New Rules: Stroke and Distance Local Rule.” Accessed July 2026.
https://www.usga.org/content/usga/home-page/rules-hub/rules-modernization/major-changes/golfs-new-rules-stroke-and-distance.html - Golf Digest. “Rules Review: Understanding course boundaries.” Accessed July 2026.
https://www.golfdigest.com/story/rules-of-golf-review-course-boundaries-ob-penalty-area-on-off-line - Golf Monthly. “The Rules On Red, Yellow And White Stakes.” Accessed July 2026.
https://www.golfmonthly.com/golf-rules/red-v-yellow-v-white-stakes
