Which Blocks Prevent Mob Spawning?

Full blocks without monsters	glass, leaves, ice, glowstone
Monster-free floor	lower slabs, carpets, and doors

Glass

Full blocks where monsters will never spawn: the game itself determines this (`isValidSpawn`). Light has nothing to do with it — monsters can spawn on Jack's lantern.

№	Block	ID	Who can
1	White Stained Glass	white_stained_glass	nobody
2	Cyan Stained Glass	cyan_stained_glass	nobody
3	Light Blue Stained Glass	light_blue_stained_glass	nobody
4	Yellow Stained Glass	yellow_stained_glass	nobody
5	Green Stained Glass	green_stained_glass	nobody
6	Brown Stained Glass	brown_stained_glass	nobody
7	Red Stained Glass	red_stained_glass	nobody
8	Lime Stained Glass	lime_stained_glass	nobody
9	Orange Stained Glass	orange_stained_glass	nobody
10	Magenta Stained Glass	magenta_stained_glass	nobody
11	Pink Stained Glass	pink_stained_glass	nobody
12	Light Gray Stained Glass	light_gray_stained_glass	nobody
13	Gray Stained Glass	gray_stained_glass	nobody
14	Blue Stained Glass	blue_stained_glass	nobody
15	Glass	glass	nobody
16	Tinted Glass	tinted_glass	nobody
17	Purple Stained Glass	purple_stained_glass	nobody
18	Black Stained Glass	black_stained_glass	nobody

Leaves

№	Block	ID	Who can
1	Acacia Leaves	acacia_leaves	Ocelot, Parrot
2	Birch Leaves	birch_leaves	Ocelot, Parrot
3	Cherry Leaves	cherry_leaves	Ocelot, Parrot
4	Oak Leaves	oak_leaves	Ocelot, Parrot
5	Yellow Poplar Leaves	yellow_poplar_leaves	Ocelot, Parrot
6	Red Poplar Leaves	red_poplar_leaves	Ocelot, Parrot
7	Azalea Leaves	azalea_leaves	Ocelot, Parrot
8	Pale Oak Leaves	pale_oak_leaves	Ocelot, Parrot
9	Jungle Leaves	jungle_leaves	Ocelot, Parrot
10	Dark Oak Leaves	dark_oak_leaves	Ocelot, Parrot
11	Flowering Azalea Leaves	flowering_azalea_leaves	Ocelot, Parrot
12	Mangrove Leaves	mangrove_leaves	Ocelot, Parrot
13	Orange Poplar Leaves	orange_poplar_leaves	Ocelot, Parrot
14	Spruce Leaves	spruce_leaves	Ocelot, Parrot

Ice

№	Block	ID	Who can
1	Ice	ice	Polar Bear

Glowstone, sea lantern, shroomlight, and toadstool lights.

№	Block	ID	Who can
1	Shroomlight	shroomlight	nobody
2	Verdant Froglight	verdant_froglight	nobody
3	Sea Lantern	sea_lantern	nobody
4	Ochre Froglight	ochre_froglight	nobody
5	Pearlescent Froglight	pearlescent_froglight	nobody
6	Glowstone	glowstone	nobody

Copper grates

№	Block	ID	Who can
1	Waxed Copper Grate	waxed_copper_grate	nobody
2	Waxed Oxidized Copper Grate	waxed_oxidized_copper_grate	nobody
3	Waxed Exposed Copper Grate	waxed_exposed_copper_grate	nobody
4	Waxed Weathered Copper Grate	waxed_weathered_copper_grate	nobody
5	Copper Grate	copper_grate	nobody
6	Oxidized Copper Grate	oxidized_copper_grate	nobody
7	Exposed Copper Grate	exposed_copper_grate	nobody
8	Weathered Copper Grate	weathered_copper_grate	nobody

Others

№	Block	ID	Who can
1	Barrier	barrier	nobody
2	Bedrock	bedrock	nobody
3	Magma Block	magma_block	zombie, blaze

Slabs, carpets, doors, and other flooring

The lower slab and regular steps do not allow monsters through, while the upper slab, double steps, and inverted steps do.

№	What	How many types	A monster appears
1	Slabs	101	on the lower half — no, on the upper half — yes
2	Stairs	97	on the lower half — no, on the upper half — yes
3	Carpets	18	no
4	Press plates	17	no
5	Hatches	22	no
6	Fences	14	no
7	Walls	32	no
8	Glass Panes	17	no
9	Rail	4	no
10	Dirt Path	1	no
11	Farmland	1	no
12	Honey Block	1	no
13	Scaffolding	1	no
14	Chest	1	no
15	Hopper	1	no
16	Lantern	1	no
17	Cactus	1	no
18	Powder Snow	1	no
19	Beacon	1	no
20	Bedrock	1	no
21	Barrier	1	no

Unclear: on these — they appear

Seems like there isn't, but the game spawns: soul sand, slime block, Jack o'Lantern, obsidian.

№	Block	ID
1	Soul Sand	soul_sand
2	Soul Soil	soul_soil
3	Slime Block	slime_block
4	Mud	mud
5	Mangrove Roots	mangrove_roots
6	Jack o'Lantern	jack_o_lantern
7	Redstone Lamp	redstone_lamp
8	Monster Spawner	spawner
9	Packed Ice	packed_ice
10	Blue Ice	blue_ice
11	Obsidian	obsidian

Frequently asked questions

On which blocks do mobs not spawn in Minecraft?

Monsters do not spawn on glass, leaves, ice, light stone, sea lantern, shroomlight, frog lights, copper plates, bedrock (only fire-resistant mobs spawn on it), or on lower planks, carpets, doors, fences, walls, rails, or paths.

Do mobs spawn on planks?

On the bottom slab: no, on the top slab or double slab: yes. Therefore, the floor made of bottom slabs protects against monsters.

Do mobs spawn on lit blocks?

Looking at: on a torch and a lighthouse — no, the game itself prohibits it; on Jack's lantern — yes. But light around still hinders monsters: they need complete darkness.

More in the wiki

All wiki content

Minecraft 26.3 data: rules, numbers, and names — from code, files, and game localization.