In Minecraft, skeleton horses occur in the game when a regular horse is struck by lightning. If you are having trouble finding a skeleton horse, you can summon a skeleton horse using a cheat or you can use a spawn egg.

How often do skeleton horses spawn?

A skeleton trap horse is a skeleton horse spawned from a fraction of lightning generated naturally by a thunderstorm or by chance (0.75–1.5% chance on Easy, 1.5–4% on Normal, and 2.25–6.75% on Hard, depending on regional difficulty).

Do skeleton horses spawn naturally?

A skeleton horse does not spawn naturally in the game so you have to use the /summon command to spawn one.