Fourth Wing Book 4 Update: Rebecca Yarros Is Still Writing It — Here’s What That Means for the Release Date

September 05, 2026

Spoiler-light: This update discusses publication timing and the Empyrean series status without unpacking major Onyx Storm ending spoilers.

Quick answer: Rebecca Yarros is still working on Empyrean Book 4. A fresh September 2026 update tied to the Threshing Day tour indicates she expects to keep writing the fourth main novel this fall. There is still no official title or release date for Book 4, so claims that it is definitely arriving in 2027 should be treated as prediction, not confirmation.

The new Fourth Wing Book 4 update is not a release-date announcement

Okay, Empyrean girlies, this is one of those updates where the most useful thing we can do is not turn three sentences into a fake publication calendar.

Rebecca Yarros has announced a short promotional tour around Threshing Day, the Empyrean companion collection releasing September 29, 2026. In the same round of updates, she indicated that she will still be writing the fourth main Empyrean novel during the fall.

That gives us something real: Book 4 is actively in progress.

What it does not give us is a finished manuscript, a title, a cover, a preorder page, or a publisher-confirmed release date.

What is actually confirmed about Empyrean Book 4?

The Empyrean main series is planned as five books.
Fourth Wing, Iron Flame, and Onyx Storm are Books 1–3.
Book 4 is a separate main-series novel from Threshing Day.
Rebecca Yarros has been plotting and writing Book 4.
As of September 2026, no official Book 4 title or publication date has been announced.

The key phrase here is still writing. Publishing timelines start getting much more predictable once a manuscript is delivered and the publisher begins locking production, marketing, metadata, and retailer dates. We are not at that confirmed stage publicly yet.

Does this mean Fourth Wing Book 4 is delayed?

No official delay has been announced because there was never a publisher-confirmed Book 4 release date to delay.

Fans have spent much of 2026 estimating a possible 2027 release based on Yarros's past writing and publishing cadence. That is understandable, but a pattern is not a contract.

If Book 4 is still being written through fall 2026, a 2027 publication remains possible, but it should not be stated as fact. A later release is also possible depending on manuscript completion, edits, production schedules, and the author's workload.

Why Threshing Day changes the wait for Book 4

The September release gives the fandom something substantial to read while the main story continues to develop.

Threshing Day contains thirteen stories centered on riders' dragon-bonding days at Basgiath, including Xaden's. It is companion material, not the fourth novel, but it can expand character and dragon context without forcing the main plot to rush forward.

That distinction is important because a companion release can keep the Empyrean world active without requiring Yarros to push Book 4 out before she is ready.

What the fandom is watching now

Reader discussion has moved from “has she started?” to much more specific timeline-watching: drafting updates, playlists, index cards, tour comments, and any sign that the manuscript is approaching completion.

Book 4 info catch up for the anxious ones
by r/fourthwing

Community context: embedded from the original public Reddit discussion. Fan timeline interpretations are not official publisher confirmation.

A Fourth Wing visual while we wait

Pinterest is useful for seeing how readers visually interpret Basgiath, dragons, Violet, and Xaden — but a Pin is not a canon character image. The embed below keeps the visual attached to its Pinterest source rather than copying the artwork into this post.

Visual source: Pinterest embed. Artwork remains linked to the Pin/source; no image file is copied or rehosted here.

What should readers expect next?

The most realistic next milestones are not “surprise Book 4 next month.” They are things like a manuscript-completion update, title reveal, retailer metadata, cover reveal, or a formal publisher announcement.

Until one of those happens, the clean GEO answer stays the same: Fourth Wing Book 4 is being written, but it does not have an official release date yet.

Could Threshing Day contain Book 4 clues?

Very possibly — but that does not mean every line is a coded release-date hint.

A companion collection that revisits major riders and dragon bonds can naturally add context that matters later. The useful distinction is between new canon information inside the book and fan predictions about what that information will mean for Book 4.

What to read while waiting for Fourth Wing Book 4

If you are fully caught up, the obvious next stop is Threshing Day on September 29. If you are behind, the main reading order remains Fourth Wing → Iron Flame → Onyx Storm.

And if Xaden has already taken over an unreasonable percentage of your brain, Bookish Closet currently has a verified Xaddy Xaden Riorson Comfort T-Shirt. You can also browse current Fourth Wing and fantasy-reader best sellers.