When Is Fourth Wing Book 4 Coming Out?

By the Ember team · Updated August 25, 2026

Fourth Wing book 4 is being written right now, but Rebecca Yarros has not announced a release date. She officially started writing the fourth Empyrean book in March 2026 after completing her standalone contemporary romance Peculiar Stars. The series is planned for five books total, so book 4 will be followed by one more after that.

In the meantime, a companion book called Threshing Day releases September 29, 2026. It contains 13 stories about beloved Empyrean characters and their dragons, all centered on the day their bonds began. Threshing Day is not book 4. It is a standalone collection separate from the main series.

Short answer

Fourth Wing book 4 is currently being written by Rebecca Yarros, but no release date has been announced. Yarros officially started writing book 4 in March 2026. A companion book called Threshing Day releases September 29, 2026, but it is not book 4.

Key facts

  • Rebecca Yarros started writing book 4 in March 2026 but has not announced a release date
  • Threshing Day (Sept 29, 2026) is a companion collection, not book 4
  • The series is planned for five books total, so two more main books are coming
  • A Prime Video TV adaptation was ordered to series in May 2026

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What we know about Fourth Wing book 4

Rebecca Yarros is writing book 4. That part is confirmed. In March 2026, Business Insider reported that she officially returned to working on the fourth Empyrean novel after finishing Peculiar Stars, her standalone contemporary romance releasing in November 2026.

What we do not know is when book 4 will be finished or when it will release. Yarros has not announced a publication date, and earlier retailer listings that teased January 2026 were proven false when Yarros herself said on Instagram that the date was impossible.

The Empyrean series is planned for five books total, so book 4 will be the second-to-last installment. After book 4, there will be one more main series book (book 5) to complete the story. No release dates have been announced for either.

Given the timeline between previous Empyrean books, the earliest realistic window for book 4 would be late 2027, but that is speculation. Yarros has not committed to a date, and given her track record of taking the time needed to get the books right, fans are learning to wait patiently.

What is Threshing Day?

Threshing Day is a companion book in the Empyrean universe releasing September 29, 2026. Rebecca Yarros officially announced the title on July 15, 2026, after weeks of fan speculation about a mysterious listing titled "Untitled Empyrean (Not Book Four)."

The book contains 13 stories starring beloved Empyrean characters and their dragons. All 13 stories center on Threshing, the day dragons choose their riders and their bonds begin. The deluxe first edition includes 16 original full-color illustrations by artist Joe Requeza.

Threshing Day is not book 4. It is a standalone collection separate from the main five-book Empyrean series. Think of it as bonus content for fans who want more time in the world while Yarros finishes book 4. At 176 pages (some retailer listings show 224 pages), it is shorter than the main series books, which run 400 to 600 pages each.

Fans have speculated that Threshing Day might fill in gaps from Onyx Storm or explore missing hours from the main timeline. One popular theory suggests the 176-page length is just long enough to explain the 12 hours Violet was missing in book 3. Yarros has not confirmed plot details beyond the Threshing theme.

Release timeline of every Empyrean book

This is the full Empyrean release timeline, including the main series books, Threshing Day, and the upcoming graphic novel adaptation.

Fourth Wing

Release:
May 2, 2023
Type:
Main series (Book 1)

Iron Flame

Release:
November 7, 2023
Type:
Main series (Book 2)

Onyx Storm

Release:
January 21, 2025
Type:
Main series (Book 3)

Threshing Day

Release:
September 29, 2026
Type:
Companion collection (13 stories)

Fourth Wing Graphic Novel: Vol 1

Release:
April 6, 2027
Type:
Graphic novel adaptation

Empyrean Book 4

Release:
Not yet announced
Type:
Main series (Book 4)

Empyrean Book 5

Release:
Not yet announced
Type:
Main series (Book 5)

Other Rebecca Yarros releases in 2026

In addition to Threshing Day, Rebecca Yarros is releasing a standalone contemporary romance called Peculiar Stars on November 17, 2026. It is not part of the Empyrean series.

Peculiar Stars is a slow-burn castaway romance about survival, self-determination, and love in its truest form. The story follows Callista and Dominic across 543 days on one island, asking the question: who are we when the rest of the world is not watching? Yarros describes it as emotionally wrecking but promises it is not a tear-jerker. It is published by Amazon Publishing under the Montlake imprint.

Yarros finished writing Peculiar Stars before returning to work on Empyrean book 4 in March 2026, so the November release does not delay book 4. It was already written.

Fourth Wing TV adaptation status

Amazon's Prime Video officially ordered Fourth Wing to series on May 11, 2026, during Amazon's upfront presentation in New York City. The fantasy romance adaptation has been in development since the book rights were optioned, and the series order confirms production is moving forward.

Meredith Averill, known for The Haunting of Hill House and Locke & Key, is adapting the series for television and will serve as showrunner and executive producer. Lisa Joy, co-founder of Kilter Films and executive producer of the series, is set to direct the pilot. Michael B. Jordan's Outlier Society is producing under its overall series deal with Amazon MGM Studios.

No filming date or release date has been announced yet. The project is currently in pre-production. Rebecca Yarros is involved in the adaptation, though her exact role has not been detailed publicly.

What to read while you wait for book 4

If you have finished Onyx Storm and need something to fill the gap until book 4, there are a few options that deliver the same fated-mates tension, morally gray love interests, and high-stakes fantasy worlds that made Fourth Wing irresistible.

Fourth Wing series reading order

If you want to revisit the full Empyrean timeline, this guide covers all three main books in order, plus what is coming next and where to start.

Books like Fourth Wing

Dragon riders, deadly war colleges, and slow-burn tension with a morally gray wingleader. These are the closest read-alikes while the wait drags on.

Best romantasy books

Explore the best fantasy romance books with fated mates, dragons, war college tension, and enemies-to-lovers arcs that hit the same notes as Fourth Wing.

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Frequently asked questions

When is Fourth Wing book 4 coming out?

Fourth Wing book 4 is currently being written by Rebecca Yarros, but no release date has been announced. Yarros officially started writing book 4 in March 2026. A companion book called Threshing Day releases September 29, 2026, but it is not book 4.

Is Threshing Day the same as Fourth Wing book 4?

No. Threshing Day is not Fourth Wing book 4. It is a companion collection of 13 stories about Empyrean characters and their dragons, all centered on the day their bonds began. Rebecca Yarros announced it as a standalone Empyrean release arriving September 29, 2026, separate from the main five-book series. Book 4 is still being written and has no release date yet.

How many books will be in the Fourth Wing series?

The Fourth Wing series is planned for five books total. Three main books are out now: Fourth Wing (April 2023), Iron Flame (November 2023), and Onyx Storm (January 2025). Rebecca Yarros is currently writing book 4, and book 5 will follow. Threshing Day (September 2026) is a companion collection and not part of the main five-book count.

Will there be a book 5 after Fourth Wing book 4?

Yes. Rebecca Yarros has confirmed the Empyrean series will have five main books total. After book 4, there will be one more book (book 5) to complete the series. No release dates have been announced for either book 4 or book 5.

What is Rebecca Yarros releasing in 2026?

Rebecca Yarros is releasing two books in 2026. Threshing Day, a collection of 13 Empyrean stories about characters and their dragons, releases September 29, 2026. Peculiar Stars, a standalone contemporary castaway romance not part of the Empyrean series, releases November 17, 2026. Neither is Fourth Wing book 4.

Sources

Fourth Wing book 4 status and Threshing Day details verified as of August 2026.

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