Your swing plane follows the slope. With the ball above your feet it gets flatter, more around your body. With the ball below your feet it gets more upright. On uphill and downhill lies the whole plane tilts with the ground, so the club needs to swing up the slope after impact on an uphill lie and down it on a downhill lie. Most of the time the best plan is to let these changes happen, set up to suit them, and aim for the curve they create.
This is written for a right-hander.
What "plane" means here
Swing plane is the angle the club travels on, relative to the ground, as it goes back and through. On flat ground it's mostly set by your posture and the length of the club. Stand closer and taller with a short club and the plane is more upright. Stand further away with a long club and it's flatter.
On a slope, the ground has moved, so the ball is higher, lower, or tilted relative to your feet. Your body adjusts to reach it, and the plane comes along for the ride.
Ball above your feet: flatter
The ball is closer to your hands, so you stand taller and the shaft sits flatter at address. The swing follows. It goes more around you, a bit like a baseball swing on a steep slope.
A flatter swing tends to close the face through impact, and the slope also tilts the face so it points left. That's why the ball goes left for a right-hander. Lofted clubs show this more, since there's more loft to point left.
Don't fight it by trying to swing more upright. You'll likely catch the slope above the ball or lose your balance. Grip down, stand taller, accept the flatter swing and aim right. Ball above your feet covers the set-up in full.
Ball below your feet: more upright
The ball is further from your hands, so you bend more at the hips, flex your knees more and the shaft sits more upright. The swing follows, going more up and down.
With the ball below your feet the slope tilts the face to point right, and it's harder to turn through and square the face from such a bent-over posture. The ball goes right. The usual fault is standing up during the swing, which pulls the club up and away from the ball. Stay down until well after impact. The full set-up is in ball below your feet.
Uphill and downhill: the plane tilts
Here the plane doesn't get flatter or steeper so much as it tilts with the hill. If you set your shoulders roughly parallel to the slope, your swing arc tilts too.
On an uphill lie, the club swings up the slope after impact. Feel like you're sweeping the ball off the hill, with a high finish. If you swing on a flat-ground plane instead, the club runs into the hill just after the ball, and you'll often dig or chunk it.
On a downhill lie, the club needs to chase down the slope after impact. Feel the clubhead staying low for longer, with the finish lower than usual. Swing on a flat-ground plane here and the club tends to clip the ground behind the ball or catch the ball on the way up.
Why slopes change the ball's flight
There's a bit of simple physics behind all this, mostly about how the slope changes the angle of the face and the effective loft at impact. If you want the plain-English version, why slopes change ball flight explains it without the jargon.
Working with it, step by step
- Take a practice swing first. Next to the ball, on the same slope. Feel where the club wants to go.
- Notice where it brushes the ground. That tells you where the low point is on this slope. More on that in use your practice swing to read a sloping lie.
- Set up to the plane the slope gives you. Taller and flatter for ball above. Lower and more upright for ball below. Shoulders with the slope for uphill and downhill.
- Aim for the curve. Right of target if the ball will go left, left of target if it'll go right.
- Swing at around 80 percent. Balance first. A smooth swing on the right plane beats a hard swing on the wrong one.
A drill for feeling plane on a slope
Lay an alignment stick on the ground along your target line. On a sidehill lie, make slow practice swings and watch the club relative to the stick. Ball above, you should see the clubhead travel more around and inside. Ball below, more up and down. Do it a few times until it feels normal, then hit.
If you never practise off slopes, every sloping lie on the course feels like starting from scratch. Libro is a portable platform that tilts up to 7 degrees along its length and 13 degrees across, so you can rehearse the flatter and more upright swings at home or at the range. It's coming to Kickstarter in early 2027, and you can reserve one for £10, fully refundable.