Frog Hair
Frog hair is a golf slang term for the closely mown strip of grass surrounding a putting green, cut shorter than the fairway but higher than the green itself. It usually refers to what most golfers call the fringe, apron, or collar.
What is a frog hair in golf?
Frog hair is the narrow band of short grass that wraps around a putting green and separates it from the fairway or rough. The blades are cut shorter than the fairway grass but a touch longer than the putting surface, which gives the area a slightly different color and texture from both. It is a transition zone, not part of the green.
The strip is usually only a few feet wide, though that varies by course design and architect preference. On many holes, the frog hair fully encircles the green. On others, it sits only in front of or beside it, with rough taking over elsewhere. The grass is short and well-kept, so a ball that lands there sits up cleanly and gives the player a wide range of options. The term shows up most often on American golf broadcasts or in conversation with older players, where it sounds friendly and old-school.
Where the term “frog hair” comes from
The expression traces to the American Southern saying “fine as frog’s hair” (or “finer than frog’s hair”), used to describe something so thin it almost can’t be seen. Since frogs do not actually have hair, the phrase suggests the finest possible texture, which is how golfers came to apply it to the closely mown grass ringing a green.
Use of the term in golf goes back well into the first half of the 20th century, mostly in the United States. Sam Snead used it in his 1962 memoir The Education of a Golfer, writing about hitting a shot into the frog hair around the green to dampen the bounce. An even earlier reference appears in a 1949 glossary by golfer Betty Hicks, where frog hair was defined as “heavy bermudagrass fringe”. International golf broadcasting from the 1960s onward spread the term beyond the US, but it remains primarily an American expression.
How short is the grass on the frog hair?
Mowing height for the frog hair sits between the green and the fairway, and the exact figure depends on the course and the grass species, with seasonal changes pushing it up or down. A typical setup looks roughly like this:
| Area | Common mowing height |
|---|---|
| Putting green (daily play) | 0.110 to 0.140 inches |
| Putting green (PGA Tour event) | under 0.100 inches |
| Frog hair / collar / fringe | around 0.25 to 0.40 inches |
| Fairway | 0.375 to 0.625 inches (3/8 to 9/16) |
| Rough | 1.5 to 3.5 inches |
Daily-fee courses and private clubs typically mow greens between 0.110 and 0.140 inches, while PGA Tour events often go below 0.100 inches and sometimes as low as 0.090 inches. USGA guidance places normal fairway height between 3/8 and 9/16 of an inch. Collars are often cut to around one-quarter inch, though the gap between the green and the collar varies widely. One superintendent on a public turfgrass forum reported greens at 0.110 inches with collars at 0.400 inches at his course.
The grass species matters too. Bentgrass and ultradwarf bermudagrass tolerate the lowest cuts, which is why they dominate modern greens. Surrounding turf is usually the same species as either the green or the fairway, just held at a slightly different height to create the visible ring around the putting surface.
Frog hair vs. fringe vs. apron vs. collar
These four terms overlap heavily, and many golfers and broadcasters use them interchangeably. There are some real distinctions, though:
| Term | What it usually means |
|---|---|
| Frog hair | Slang for the whole closely mown ring around the green; the most casual of the four. |
| Fringe | The most common modern term, especially in North America. The strip of short grass surrounding the green. |
| Collar | A near-synonym of fringe, often used by superintendents and rules officials. The technical name for the band of grass that rings the green. |
| Apron | Specifically the area in front of the green, where the fairway transitions into the putting surface. Sometimes mowed at fairway height rather than collar height. |
A useful way to remember it: a green can have a collar all the way around it, but the apron sits only at the front, where balls running up from the fairway first reach the putting area. Frog hair is the friendly catch-all that covers any of these.
Rules and play from the frog hair
Under the Rules of Golf, the frog hair is part of the general area, not the putting green. Rule 2.2a defines the general area as everything on the course except the teeing area, bunkers, penalty areas, and the putting green, which means the fringe is treated as general area even though it sits right next to the green. A few practical points follow from that:
A player cannot mark, lift, clean, and replace the ball as freely as on the green. Spike marks and other imperfections cannot be repaired the same way either. If a ball is putted from the frog hair, the stroke does not count as a putt for stat-tracking purposes on the professional tours, even when the player uses a putter. The flagstick rule still applies, so a player can leave it in or take it out.
For shot choice, the frog hair gives the golfer options that the rough does not. Many players reach for the putter when the lie is clean. The stroke can feel almost like a long putt across the green, with the ball just rolling slightly slower through the taller grass before reaching the surface. A wedge or short iron suits situations where the ball is sitting down, or the grass looks uneven. The bump-and-run sits between those two. It is a low-running shot played with a hybrid or low iron. The ball skips onto the green and rolls toward the hole, which often works well on firm greens with a back pin.
Related Golf Terms
- Fringe — The strip of grass between the green and the fairway or rough.
- Approach shot — A shot played toward the green, often the one that determines whether a ball ends up on the putting surface or in the frog hair.
- Collar — A technical synonym of fringe, often used by superintendents and in rules contexts.
- Apron — The fairway-side strip in front of the green where the fairway meets the putting surface.
- Fried egg — A ball buried in a bunker with sand splashed around it like a fried egg.
Frequently Asked Questions
Why is it called frog hair?
The name comes from the old American phrase “fine as frog’s hair,” used to describe something so thin it’s barely visible. Since frogs have no hair, the comparison suggested the finest possible texture, which fit the closely mown grass ringing a green.
Is frog hair the same as the fringe?
In casual use, yes. Most golfers treat frog hair, fringe, and collar as the same thing. The apron is slightly more specific and refers to the strip directly in front of the green.
Can a player putt from the frog hair?
Yes. Putting is a common choice when the grass is tight, and the lie is clean, though the ball will roll a little slower than on the green because the grass is taller.
Does a putt from the frog hair count as a putt?
Not for official stat-tracking on the professional tours. A stroke played from the fringe is not counted as a putt, because the putting green is the only place from which traditional putts are recorded.
Is the frog hair part of the green?
No. It is part of the general area under the Rules of Golf, even though it is mowed close and sits flush against the putting surface.
Where does the term come from in golf history?
The earliest references appear in mid-20th-century American golf writing, including Betty Hicks’ 1949 glossary and Sam Snead’s 1962 book.
Sources
- Golf Compendium. “Here’s What the Golf Lingo ‘Frog Hair’ Means.” Accessed May 2026.
- Wiktionary. “Frog hair.” Accessed May 2026.
- Wikipedia. “Glossary of golf.” Accessed May 2026.
- Liveabout. “Understanding the Fringe on Golf Courses.” Accessed May 2026.
- Liveabout. “The Apron of Golf: The Putting Green’s Grassier Perimeter.” Accessed May 2026.
- Caddie AI. “What Height Are Golf Greens Cut At?” Accessed May 2026.
- USGA. “Understanding Mowing Heights.” Accessed May 2026.
- USGA. “Fairway and Rough Heights Vary By The Season.” Accessed May 2026.
- Aggie Horticulture, Texas A&M. “Greens Maintenance.” Accessed May 2026.
- Lightspeed. “Your Guide to Golf Course Maintenance Equipment.” Accessed May 2026.
- Golf with Brio. “Fringe / Apron in Golf: Meaning, Rules, and How to Play From It.” Accessed May 2026.
