Green speed
Green speed is how fast a golf ball rolls across the putting surface after being struck. It is measured in feet using a device called a Stimpmeter, with higher numbers meaning faster greens.
What is green speed?
Green speed describes the pace of the putting surface, or how far a golf ball will roll after being struck with a given amount of force. A green that lets the ball glide a long way is called fast. A green that grabs the ball quickly is called slow. The number used to express this is a distance in feet, taken with a small device called a Stimpmeter on a flat patch of the green.
Several physical qualities of the surface combine to produce a green’s speed: the smoothness of the cut, the firmness of the soil underneath, the height of the grass, and the resilience of the turf. According to Penn State University Extension turfgrass research, smoothness and firmness are two of the main factors, since a smoother, harder surface creates less friction and lets the ball roll farther.
A short note on terminology. Golfers often use “green speed” and “Stimp reading” to mean the same thing. Strictly, the Stimp is the number produced by the measuring device, and the green speed is the playing characteristic that number describes.
How green speed is measured
The Stimpmeter is a 36-inch aluminum bar with a V-shaped groove running along its length. A golf ball sits in a notch near the top. As the bar is slowly raised to roughly 20 degrees, gravity pulls the ball loose and sends it down the groove onto the green at a fixed release velocity of 6 feet per second, per the United States Golf Association.
Whoever is taking the reading rolls three balls in one direction on a level patch of the green and measures how far each one travels. The three distances are averaged. They then roll three more balls back along the same line in the opposite direction and average those. Those two averages are then averaged together. That final figure, in feet, is the green’s speed. So a reading of 9 means the average ball rolled nine feet, and a reading of 12 means twelve.
Edward S. Stimpson, a former Massachusetts state amateur champion, built the original wooden version in 1935 after watching balls run off the greens at the U.S. Open at Oakmont, according to Wikipedia and Golf Digest reporting. The USGA’s Frank Thomas redesigned it in aluminum in 1976, and a third-generation device by USGA research engineer Steven Quintavalla was released in 2013 with tighter manufacturing tolerances and an option for testing on shorter level patches.
Green speed ranges
Numbers alone don’t mean much without context. The table below is a rough guide to where common green speeds sit, drawn from USGA recommendations and PGA Tour reporting.
| Stimp reading | How it plays | Typical setting |
|---|---|---|
| 6 to 7 | Slow | Older or unkempt municipal courses |
| 8 to 9 | Medium-slow | Most public courses and weekend club greens |
| 9.5 to 10.5 | Average modern | Well-kept public and private clubs |
| 10.5 to 12 | Fast | PGA Tour weekly events, top private clubs |
| 12 to 13 | Very fast | Major championships |
| 14+ | Extreme | Augusta National, Oakmont in tournament setup |
The figures shift over a season, and even within a single day. In 1978, when the USGA standardized the Stimpmeter and began surveying American courses, the average reading was 6.5 feet, and only 2 percent of courses measured higher than 9, per research summarized by Keiser University College of Golf. Today, well-maintained public courses generally roll between 8.5 and 10.5, and PGA Tour event greens typically run between 10.5 and 12, with the majors often pushing 13 or higher.
Two extremes are worth knowing. Oakmont Country Club, where Stimpson first observed the problem of fast greens, has produced readings of 15 feet during championship setup. Augusta National’s greens during the Masters are often reported in the 12-to-14 range and sometimes higher.
What affects green speed
A green’s speed is not fixed. The same green can play three different speeds in a single day, depending on weather, traffic, and what the maintenance crew has done that morning. The main factors:
Mowing height. Shorter grass produces less friction. Penn State turfgrass research shows that ball roll increases as cutting height decreases, with most modern putting greens mown to between roughly 0.10 and 0.19 inches.
Grass type. Bentgrass has fine blades and a smooth surface, which makes it the go-to species for fast greens. Bermuda is slower, especially when warm weather drives aggressive growth. Mixtures with poa annua can play unevenly and are notoriously hard to keep consistent through the day.
Moisture. Water is the single biggest day-to-day variable. Wet grass slows the ball; a dry, firm surface speeds it up. Morning dew, recent rain, and irrigation all hold the speed of a green down for a few hours.
Rolling and topdressing. Course staff can flatten and smooth a green by passing a heavy roller over it or by spreading a thin layer of fine sand across the surface. Both practices push the speed up.
Slope and grain. Downhill putts run faster than uphill putts on the same green, regardless of what the meter says on a flat patch. The direction the grass blades lean, known as the grain, also matters. Penn State research found ball roll differences of 24 to 30 inches between putts struck with the grain and putts struck against it.
Why faster isn’t always better
Television coverage of professional events has trained viewers to associate fast greens with quality, but the United States Golf Association has spent decades pushing back on that idea. The right speed for a given course depends on the contours of its greens, the grass species, the maintenance budget, and the skill level of the people playing there, per the USGA.
Pushing greens past their natural limit causes problems. Faster greens shrink the number of usable hole locations, because slopes that were playable at 10 become unplayable at 12. They make rounds slower. They cost considerably more to maintain, since fast surfaces require more frequent mowing and often hand-watering by staff instead of automatic irrigation. They also stress the turf, which leaves it more vulnerable to disease.
A green that rolls at 9 on a course built for 9 is a better putting surface than the same green forced up to 11. Speed is one factor in green quality, alongside how true the surface rolls and how consistent it plays from one hole to the next.
Related Golf Terms
- Grain — The direction grass grows on the green, which affects the speed and break of putts.
- Green — The smooth, closely mown putting surface surrounding the hole.
- Green fee — The charge for playing a round of golf at a course.
- Golf simulator — An indoor system that uses sensors and screens to simulate real golf.
- Golf tee — A small peg used to elevate the ball for the first stroke on each hole.
Frequently Asked Questions
What is a good green speed for an average golf course?
A reading between roughly 9 and 10.5 on the Stimpmeter is widely considered a good speed for the average public or private course. It is quick enough to feel responsive and slow enough that high-handicap players can still control distance.
Is a Stimpmeter reading the same as green speed?
Yes, in everyday use. The reading from a Stimpmeter, given in feet, is what golfers call the green speed. Strictly, the speed is the playing characteristic, and the Stimp is the measurement of it.
What is the fastest green speed ever recorded?
Oakmont Country Club has produced readings of 15 feet or higher in championship setup, which is generally accepted as the fastest end of regular tournament golf. Anything above 14 is considered extreme.
Why do greens often get faster later in the day?
As morning dew and irrigation evaporate, the surface dries out and friction drops. Heat and wind speed that dries along. On a hot, dry day, late-afternoon greens can roll a foot or more faster than they did at sunrise.
Do amateur courses play faster or slower than the PGA Tour?
Almost always slower. Most public and amateur courses sit between 8.5 and 10.5 on the Stimpmeter, while PGA Tour events typically run from 10.5 to 12, and major championships push past 13.
Sources
- United States Golf Association. “The Truth About Green Speeds.” Accessed May 2026.
- Penn State Extension. “Factors Affecting Green Speed.” Accessed May 2026.
- Wikipedia. “Stimpmeter.” Accessed May 2026.
- Golf Digest. “U.S. Open 2025: This device will be all the rage at Oakmont. So what is a Stimpmeter anyway?” Accessed May 2026.
- Keiser University College of Golf. “Stimpmeter Explained: What Is and How Does A Stimpmeter Work?” Accessed May 2026.
- Golf Monthly. “What is a stimpmeter in golf and how does it work?” Accessed May 2026.
- PrimePutt. “Everything You Ever Wanted to Know About Stimpmeter and Green Speed.” Accessed May 2026.
