Slow Horses Season 6: Cast, Release Date, Episodes & News

Anyone who’s been glued to the disheveled world of Jackson Lamb knows the pain of waiting for the next season of Slow Horses, which has quietly become one of the most reliable shows on streaming — and with seasons 6 and 7 both confirmed, the endgame is now in sight. Here’s what’s actually known about season 6, from renewal to cast to when you might finally see it.

Renewal announced: October 2024 · Source material: Novels Joe Country and Slough House by Mick Herron · Season 6 episodes: Expected 6 (typical per season) · Release window: 2026 (not yet confirmed) · Seasons ordered: 6 and 7 · Lead actor: Gary Oldman as Jackson Lamb

Six rows of key facts—most carry a thread of consistency: the show has a clear novel roadmap, and Apple TV+ is treating it as a flagship.

Is there a season 6 of Slow Horses?

Official renewal announcement

• Apple TV+ officially renewed the series for a sixth season on October 14, 2024 (Cosmopolitan). The announcement came as part of a two-season order: seasons 6 and 7 were greenlit together.

• The renewal was confirmed before season 5 had aired, signaling strong internal confidence from Apple TV+.

“Season 6 is a story in which the Slow Horses are on the run while Diana Taverner draws them into a retaliatory, high-stakes game.” – Apple TV+

Source material for season 6

• Season 6 will draw from Mick Herron’s novels Joe Country (2019) and Slough House (2021), according to secondary reporting (Dailymotion). The two books continue the narrative of MI5 agents exiled to Slough House.

• The plot reportedly explores post-Brexit politics, internal MI5 betrayal, and a targeted killing spree — themes that align with the show’s escalating stakes.

The implication: With a clear literary roadmap, season 6 is less likely to suffer from the “filler” syndrome that plagues other shows. The narrative pressure is already baked in.

Has season 6 of Slow Horses been filmed?

Production timeline

• As of early 2026, Apple TV+ has not publicly announced a production start date for season 6 (Cosmopolitan). While some reports suggest filming may have already wrapped (Cosmopolitan), this has not been corroborated by official channels.

• Season 5 finished airing in late 2025 (YouTube), leaving a typical gap of 12-18 months before a new season — which points to a 2026 release rather than anything earlier.

“Little has been officially confirmed about the rest of the season 6 cast beyond Gary Oldman.” – Cosmopolitan

Expected filming dates

• Based on the show’s pattern (season 4 shot in 2023, season 5 in early 2024), a likely filming window for season 6 would be mid-2025 to early 2026. Without an official announcement, this remains an inference.

• The concurrent renewal of season 7 suggests that filming for both seasons could be back-to-back, similar to how the show handled earlier seasons.

The trade-off: Back-to-back production would compress the release gap between seasons 6 and 7, but it also means a longer initial wait.

Where can I watch Slow Horses season 6?

Streaming platform

• Slow Horses is an Apple TV+ original (TV Guide). Season 6 will premiere exclusively on Apple TV+, just like all previous seasons.

• The show is not available on Netflix, Amazon Prime, or any other streaming service. An Apple TV+ subscription (currently $9.99/month) is required.

Release date and availability

• No official release date has been set. The most cited expectation is autumn 2026, based on the show’s historical release pattern (Cosmopolitan).

• TV Guide lists season 6 as a 2026 season (TV Guide), but this is likely a placeholder date rather than a confirmed release.

What this means: If you’re not an Apple TV+ subscriber, you’ll need to sign up to watch season 6. No other platform is in play.

Is there a 7th season of Slow Horses?

Renewal for season 7

• Season 7 was officially renewed alongside season 6 in October 2024 (Cosmopolitan). The two-season order covers the remainder of Mick Herron’s current Slough House series.

• This is widely interpreted as the final season, giving the showrunners a chance to write an intentional ending rather than rushing a conclusion.

Source material for season 7

• Season 7 will adapt the novel Bad Actors (2022), the eighth book in the Slough House series (Dailymotion). The book continues the high-stakes MI5 tension set up in the previous novels.

• Mick Herron has hinted that the series might continue beyond Bad Actors, but for now, season 7 is positioned as the finale of the show’s current narrative arc.

The pattern: By securing two seasons in one deal, the creative team can build a coherent finale that pays off years of character development.

How many episodes are there in season 6 of Slow Horses?

Episode count from previous seasons

• Every previous season of Slow Horses has contained exactly 6 episodes (TV Guide). Season 5, season 4, and the earlier seasons all follow this format.

• TV Guide currently lists season 6 with six episode slots (Episode 1 through Episode 6), but these are placeholder entries without titles (TV Guide).

Expected episode structure

• Given the consistent format, season 6 is almost certain to follow the 6-episode model. Each episode typically runs 45-55 minutes, with the season finale often extended.

• A six-episode structure allows for tight, novel-like pacing — each episode roughly covers a chapter of the source material.

The implication: Don’t expect an expanded episode count. The show has found its groove at 6 episodes per season, and deviating now would risk the narrative density that makes it work.

The episode count remains unconfirmed but the pattern is consistent.

Timeline: Slow Horses seasons 6 and 7

• October 2024: Apple TV+ renews Slow Horses for seasons 6 and 7 (Cosmopolitan)
• Spring 2025: Season 5 premieres (expected) (YouTube)
• 2026: Season 6 release window (unconfirmed) (Cosmopolitan)
• TBD: Filming start for season 6 (unannounced)
• TBD: Season 7 expected after season 6

The pattern: The show has averaged one season every 12-18 months since 2022. If that holds, season 6 arrives in autumn 2026, and season 7 in late 2027 or early 2028.

What we know versus what’s still uncertain

The balance: Low official information from Apple TV+ leaves fans relying on secondary reporting. Until the studio releases an official timeline, treat all dates as educated guesses.

For fans of Slow Horses, the coming years promise a satisfying conclusion to one of the most consistently excellent spy dramas on television. The dual-season order gives the creative team room to craft an ending worthy of Mick Herron’s novels. For Apple TV+, the gamble is clear: invest in two final seasons now, or risk losing momentum. The real question is whether the studio can close the release gap — because for viewers waiting to see what happens to Lamb and his team, every extra month of silence is a small betrayal.

Frequently asked questions