You can expect Season 5 to air in Fall 2025, with both seasons releasing approximately every year since inception. An official release date has not been announced as of April 2026; it appears likely that Season 6 will be released in Fall 2026 as they continue their consistent timeline for new seasons.

Filming for Season 6 was completed on schedule, with reports indicating filming wrapped by February 2025 or earlier! Gary Oldman has confirmed in various interviews (including post Golden Globe interviews on ScreenRant) that filming was fully complete by late 2025 and that production for Season 7 began in October 2025! These tight shooting schedules, overlapping production crews, and fast pace have allowed Apple to continue producing Slow Horses without long delays.

Post production is currently underway, with trailers/sneak previews being released in early to mid 2026. The new six-part season will incorporate elements from Mick Herron's novels (likely based on Joe Country and other stories), with Gary Oldman reprising his role as the irreverent Jackson Lamb alongside the other main characters.

There is some speculation that Season 6 may be even sooner than planned, given the rapid production and completion timelines; however, it seems safe to conservatively predict a Fall 2026 airdate or sometime in that time frame to coincide with previous airings of seasons.