What happens on the course before you reach the green
You’ve marked the line, calibrated the force, and executed the putt with precision. And yet, the ball stops half a meter short of the hole. Last Tuesday, the same stroke rolled a meter and a half too far. Has the green changed? Yes. But not in the way you might think.
Green speed is not a constant. It is the result of decisions made every morning before sunrise, and weather conditions that cannot always be controlled.
How is green speed measured?
The reference instrument is the stimpmeter: a metal ramp approximately 90 centimeters long that releases a ball from a constant height and angle. The distance the ball travels – expressed in feet – defines the speed of the surface. This measurement is taken every morning, and the number can vary daily.
9 – 10 ft | Average Club
11 – 13 ft | PGA Tour
14+ ft | Augusta Masters
The four factors that determine speed
- MOWING HEIGHT
This is the most direct lever. Precision reel mowers are set to the exact millimeter. Each millimeter of reduction corresponds to approximately one additional foot on the stimpmeter. On ordinary days, mowing is done at 3.5 mm. For slightly more speed, it can be reduced to 2.5 mm. Below this threshold, the grass begins to lose vitality and the surface deteriorates.
- ROLLING
After mowing, a steel roller is passed over the surface. This operation compresses the soil and straightens the grass blades, which tend to lean in the direction of mowing. A leaning blade creates friction; an upright blade allows the ball to roll smoothly. Rolling can add between half a foot and a full foot without needing to lower the mowing height and without subjecting the grass to additional stress.
- MOISTURE
This is the factor that surprises players the most. A wet green is invariably a slow green: water on the surface cushions the ball and increases friction. For this reason, irrigation always takes place in the early morning hours, and moisture sensors precisely dose the water. A night of heavy rain can immediately reduce the stimpmeter by a foot and a half.
- DOUBLE CUTTING AND VERTICUTTING
On certain days, two crossed mowing passes are performed, so that the second pass is perpendicular to the first. Additionally, a verticutter is used – a brushing process that lifts and removes horizontally growing grass, known as “grain,” which is responsible for much of the resistance the ball experiences when rolling. This combination can add nearly an additional foot to the stimpmeter.
Why not always at maximum?
A green cut at its tolerance limit week after week degrades over time. Roots diminish, the grass loses density, and diseases appear. Extreme speed can be maintained for a few days, but maintaining it year-round would destroy the surface. The task is to find the balance: greens that are as fast as agronomy sustainably allows.
The invisible effort
When greens roll differently than expected, it’s worth looking at the clock. At eight in the morning, the greenkeeping team has already been working since five. At T Golf Calvia, green quality is not a coincidence: it is the result of daily, millimeter-precise work.
In 2026, one of the main tasks is to further improve the playing experience on the greens while maintaining the prestige that distinguishes T Golf Calvia as a reference on the island.
