
Alternate biome transitions
I don't know my version or loader








This datapack adds transitions between biomes (small blobs of each extend into the other) to break up the harsh transitions between some biomes. See the gallery for images of what this looks like. This datapack also makes colder biomes generate further out higher up to make mountain transition more realistic.
Finding biomes
Because this datapack makes colder biomes generate higher up, the /locate command may find biomes up in the sky (i.e a plains 400 blocks above a savanna). This is especially common when increasing the height of a world. To counteract this, you should try to find the biome in an unmodified world. The same biome should be there in the world with this datapack (though sometimes there could be a closer one, if one almost generated, this datapack may generate a transition to it).
Customising
As of version 1.1.2, internally there is a config. Due to datapack limitations, you must edit the datapack to do this. To do this you should
- Unpack the zip file (copy contents into a new folder). For readability, I will refer to this folder as
datapack. - From the folder
datapack, go todata/alternate_biome_transitions/worldgen/density_function/constants/. - Edit the constants, currently
temperature_height_drop_amplitude.jsoncontrols how much the biome temperature drops when travelling upwards. 0 means no drop, 1 means default drop, numbers between them will blend between the two.
- Save the files.
- Create a new zip file and copy the contents of the folder
datapackinto it. This is now your modified version of this datapack.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20, 1.20.1, 23w31a
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — see the MC Java Mods guides for the full walkthrough.
- Downloads as alternate_biome_transitions_1.1.3.zip
- Download size: 540 KB
- Download link checked 1 Sept 2026 — working
These come from our own check of the pack file, not from the source page.