Valheim 1.0: Start a New World or Keep Your Old One?
Valheim 1.0 launches on September 9, 2026 with the Deep North, the final biome. If you run a server, this is the one decision you have to make before that date, because it cannot be undone gracefully afterwards: keep the world your group has built on, or start fresh for launch. This page is the decision itself. The mechanics, the launch facts and the update checklist each have their own page, linked where they matter.
Last verified: September 3, 2026, against the official Valheim 1.0 FAQ. Every developer statement below is a direct quote from it.
The short version. Your old world keeps working and nothing is wiped. But the Deep North only generates in ground nobody has explored yet, and Iron Gate's own advice is to start over. For a server, the right answer depends on one thing: how much of your map's far north your players have already walked through.
What Iron Gate actually says
Three statements from the official FAQ settle the facts. Everything else on this page is reasoning from them.
- Old worlds survive: "Your old saves will still be where you last left them, and you can continue to play with them if you like."
- New content still arrives in old worlds, with a limit: "your world will receive new content even if it was created before the update, although biome generation will only work properly on areas that have not yet been explored."
- The recommendation: "we always recommend that you start the game over from scratch to get the best possible experience."
Note what is not there. Iron Gate does not say old worlds break, do not get the new biome, or need to be wiped. The recommendation is about the best experience, not about compatibility.
Why an old world gets less Deep North
Valheim locks a piece of terrain into whatever it was the first time that area loaded. The Deep North has always existed on the map as an empty region at the top; its content arrives with 1.0. That content will fill in any part of the north that has never been loaded, and will not fill in any part that has. So an old world does not lose the Deep North. It loses the Deep North in the places your players have already visited.
The full mechanism, including how to check what counts as explored, is on will Deep North break already-explored areas. The short answer there is the same as here: builds and characters are safe, and only unexplored ground generates the new biome.
The decision, for a server
Work through these in order. The first one that clearly applies is usually the answer.
Keep the old world if
- Your players have barely touched the north. Most groups that finished the Ashlands have not sailed the far northern coast, because there was nothing there. If the northern edge of your map is still unexplored, the Deep North will generate there on an old world almost exactly as it would on a new one.
- The base is the point. A long-running server with a large shared build, a village, or a year of accumulated work is not something a group wants to redo. Nothing about 1.0 threatens that build.
- Your group is mixed. If some players want to keep going and others want a fresh start, keep the old world and add a second one. See the fallback below.
Start a new world if
- The north has already been explored. If your players have mapped the northern coast, sailed around it, or built there, that ground is locked as the empty placeholder it was. The Deep North will not appear in it. This is the case where an old world genuinely gets a worse launch.
- You want the launch as Iron Gate designed it. The developers' own recommendation exists for a reason: 1.0 tunes the whole progression, not only the last biome. A fresh world is the only way to play it end to end as intended.
- The group is coming back after a long break. Returning players often prefer starting together rather than rejoining a world where one person is far ahead. A shared restart on launch day is the cleanest way to bring a lapsed group back.
- The world was heavily modded. Mods that are not updated for 1.0 will break, and a world that depended on them can carry that damage forward. Launching vanilla on a fresh world sidesteps it. See finding which mod broke and verifying a vanilla install.
The option that is not either/or
A server does not have to pick one world. Keep the old world file, generate a new one for launch, and switch between them. Your builds are preserved in the old save, your group gets the full Deep North in the new one, and if launch enthusiasm fades in a month, the old world is exactly where you left it.
The world lives in a .db and .fwl pair, and switching means pointing the server at a different pair. How to move worlds on and off a server is covered in uploading a world and downloading a world. Characters are stored separately from worlds, so a player keeps their character, skills and inventory across both.
What to do before September 9 whichever way you go
- Take a backup you have actually tested. Not a backup you assume works. Restore it once to a scratch world and confirm it loads. See creating backups and restoring a backup.
- Decide about mods now, not on launch day. Plan to run vanilla for the first days after 1.0 regardless of the world choice. Modded servers are where launch-day breakage happens.
- Tell your players which way you went. The most common launch-day support question on a group server is "where did our base go?" from someone who did not read the announcement.
- Check the north before you decide. If you are on the fence, the single fact that settles it is whether your northern coast is explored. The world compatibility page shows how to check.
The full launch-week runbook, with capacity checks and the update sequence, is on Valheim 1.0 server readiness.
Common questions
Will 1.0 delete or wipe my world?
No. "Your old saves will still be where you last left them." Nothing about the update touches existing saves. The only thing an old world misses is new biome content in ground that was already explored.
If I keep my old world, do I get the Deep North at all?
Yes, in every part of the north that has never been loaded. If your players never went there, you get essentially the whole biome. If they mapped it, you get none of it in the mapped parts.
Can I get the Deep North into an explored area without a new world?
Not with supported tools. There is no official way to reset explored terrain, and unofficial approaches risk the save. The realistic options are a new world, or the two-world setup above.
Does my character carry over to a new world?
Yes. Characters and worlds are separate files. A player can bring an existing character, with its skills and inventory, into a fresh world. Whether your group wants that is a house rule, not a technical limit.
Is Iron Gate saying old worlds are broken?
No. The recommendation to start over is about getting "the best possible experience", and it is the same advice they have given at every major update. It is not a compatibility warning.
Related pages
- Valheim 1.0: release date, platforms, and what it changes for servers
- Will Deep North break already-explored areas?
- Valheim 1.0 server readiness checklist
- Preparing for the Deep North biome
- Creating backups
- Uploading a world to your server
Running two worlds side by side is a few clicks on a managed Valheim server: the old world stays backed up and restorable while the new one takes the launch, so the decision on this page stops being one-way.