Instructions
Stand on the left side of the horse while she is standing on level ground.
Slide your right arm on top of the stirrup leather and underneath the saddle seat, to where the stirrup attaches to the saddle.
Lift the stirrup up with your left hand and place the bottom of the stirrup at your right underarm. Have a helper adjust the stirrup's length so the bottom of the stirrup touches your underarm.
Repeat this process to adjust the right stirrup length. This will give you an approximate stirrup length. For a more precise fit, follow steps 5 and 6.
Mount your horse wearing your riding boots. Take your feet out of both stirrups and let both legs hang down naturally. Have your helper adjust the stirrup leathers on both sides so that the stirrup bottom is level with your anklebone.
Place both feet in the stirrups and stand at your full height. Place one of your fists between your bottom and the saddle seat. Adjust the stirrup leathers so your fist will fit in this area.
How to Measure Western Stirrup Length
The length of your stirrups should accommodate the length of your legs without causing stress. Stirrups that are too short for a you can create muscle cramps on day rides or trail rides. If the stirrups are too long for you, your feet can slip out easily if your horse breaks into a run. This can lead to falls and injury. To prevent this, have a helper adjust the stirrups for you by sliding the buckles up or down while you measure yourself to the saddle and horse.