Mobs Not Spawning in Minecraft? Full Fix (2026)

The mob cap is likely full. Check F3 on Java and look at the entity count. If it's at or near the cap, light up caves below you. A full cap stops all new spawning regardless of light levels.

Your AFK position is probably wrong, or the mob cap is full from cave spawns. You need to stand 24–128 blocks from the spawn platform. Also, check that the spawn floor has no slabs, carpet, or accidental light sources.

Yes. Mobs only spawn in chunks within simulation distance. If the simulation distance is 4 chunks, mobs spawn very close to you and nowhere else. Raise it to at least 8 for functional mob farms.

In Java Edition singleplayer, the hostile mob cap is 70. When 70 hostile mobs are loaded in chunks around you, no new hostile mobs spawn. The cap is separate for passive mobs (10), ambient mobs (15), and water creatures (5).

assively. Every mob spawning in a dark cave counts against the same mob cap your farm uses. A world with unlit caves routinely sees farms run at 10–20% of their theoretical maximum rate. Lighting every cave within 128 blocks is usually the single biggest performance improvement for a mob farm.