The third season has concluded, and the fourth will be the last – but apparently, the story isn't meant to end there. A report mentions a spin-off that could enter pre-production this year. The novel's author publicly denies this, but a detail on the studio lot still seems to support the idea.
Following the conclusion of the third season, Silo's future is already set: the fourth and final season will premiere on July 9, 2027. Now, Apple TV journalist Sigmund Judge reports that Apple is simultaneously working on a standalone sequel. His information comes from a post on Threads; there has been no confirmation from Apple.
Key Facts at a Glance
- A spin-off of Silo should be able to go into pre-production later this year.
- The basis for the story is said to be an upcoming novel by Hugh Howey, set around Silo 40.
- Howey himself publicly denies the account
- The sets for the series are still standing six months after filming wrapped.
- Apple has already expanded two science fiction titles in its own catalog with spin-offs.
What the report calls
According to Judge, a Silo spin-off is in development and could enter pre-production later this year. It will be based on a yet-to-be-published novel by Hugh Howey, whose plot revolves around Silo 40 – one of the other bunkers beyond the location shown so far.
Regarding reliability: Judge reports regularly on Apple's streaming business, citing his own sources. However, he provides no evidence in this case; it is an assertion without documentation. Neither a production order nor a studio statement supports this claim.
The author disagrees
What's unusual about this report is the dissenting voice. Hugh Howey, whose novels the series is based on, publicly rejects the account. This puts two statements in direct opposition: a report about a project in development and a denial from the very person whose book is supposed to form the basis of the series.
The contradiction cannot currently be resolved. Both versions can coexist if a project is in an early stage where contracts have not yet been signed – however, this explanation is not mandatory and is not supported by anything.
The scenery is still there
The most interesting clue comes not from an insider, but from the studio premises. It's common practice for sets to be quickly dismantled and reused after a production ends, because the space is needed for other projects. This didn't happen with Silo.
The passage of time makes the point tangible: Apple confirmed the completion of filming for season 4 in early March, which was six months ago. Leaving sets of this size unused for half a year costs money – unless they are still needed.
Apple's patterns in science fiction materials
A spin-off wouldn't be an isolated case, but rather the continuation of a recognizable practice. With For All Mankind, Apple expanded the universe with Star City, and the Monarch universe also received a spin-off. In both cases, the goal was to keep an established world usable beyond the end of the original series.
The logic is particularly clear in the case of For All Mankind: the series ends with season 6, while the spin-off continues. This same pattern could be applied to Silo, whose fourth season is also announced as its finale.
Why the scenery weighs more than the denial
Our expectation: A spin-off is more likely than the denial suggests. This isn't based on the report itself, but on two documented points – the unused sets six months after filming wrapped and Apple's documented practice with two other science fiction franchises. Furthermore, an author can deny a project in good faith as long as nothing is signed.
For viewers, this doesn't change anything in the short term: The fourth season doesn't start until July 2027, almost a year away, and a spin-off that went into pre-production now wouldn't be available until after that at the earliest. So, anyone who isn't familiar with the series has plenty of time – all previous seasons are available on Apple TV.
Do you trust the report or the denial more – and would a spin-off set in a different silo even appeal to you, or should the story end with season 4? Share your prediction in the comments.
