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Season 21
The current Sea of Thieves season is estimated to end around December 29, 2026 (EST.). 100 days left. The Battle Pass (999 Ancient Coins (~$9.99 USD)) closes at the same moment — anything unclaimed is gone forever.
Season ended This Sea of Thieves season has ended. The next season's dates appear here as soon as the publisher confirms them.
In your time zone 15:00 UTC on Dec 29
| Location | Local time | Local date |
|---|---|---|
| Los Angeles | 07:00 PST | Dec 29 |
| Chicago | 09:00 CST | Dec 29 |
| New York | 10:00 EST | Dec 29 |
| São Paulo | 12:00 GMT-3 | Dec 29 |
| London | 15:00 GMT | Dec 29 |
| Berlin | 16:00 CET | Dec 29 |
| Moscow | 18:00 GMT+3 | Dec 29 |
| New Delhi | 20:30 GMT+5:30 | Dec 29 |
| Singapore | 23:00 GMT+8 | Dec 29 |
| Tokyo | 00:00 GMT+9 | Dec 30 +1 day |
| Sydney | 02:00 GMT+11 | Dec 30 +1 day |
The date above is the publisher’s own but not yet final, so it carries an EST. tag until it is confirmed.
Every game is reviewed daily and re-verified against the publisher's own source as its deadline approaches; the verification date printed above is when that last happened for this one. Historical cadence is context only — an official date always replaces an estimate, the same day, and the correction records what the date was changed from.
Sea of Thieves Season 21 is estimated to end around December 29, 2026 (verified September 18, 2026). Track the live countdown for Sea of Thieves Season 21. Synced with official developer announcements and updated every second in your browser.
Sea of Thieves Season 21 went live on September 17, 2026 (15:00 UTC), timed to coincide with Talk Like a Pirate Day. Rare has not officially confirmed the exact end date and typically posts it only shortly before the next season launches, so the countdown above tracks a cadence-based estimate while the endDateConfirmed flag remains false — recent Sea of Thieves seasons have run roughly 13 weeks each.
Season 21 shifts the focus from a single headline feature to the game's live structure: a packed calendar of events, new social tools, fresh Custom Seas options and a broad set of seasonal cosmetics.
The season's standout addition is the Parley Pennant, a new ship flag that signals to nearby crews that you're open to talk — proposing an alliance, teaming up on challenges, or simply socialising rather than fighting.
Custom Seas gains new options in Season 21, including customisable treasure-placement presets, adjustable day/night cycle speed, and a toggle to show other ships on the world map. The season also runs a heavy events schedule, including Bilge Rats Weekenders, a Community Weekend and the return of Last Ship Standing: Sloops.
New cosmetics span clothing, weapons and ship customisations, including ranges themed around famous faces of the Sea of Thieves and a suite of prestigious items reserved for Pirate Legends.
Sea of Thieves seasons target around 13 weeks (~90 days). Season 20: Custom Seas ran June 18 – September 17, 2026 (91 days), preceded by Season 19 (March 19 – June 18, 2026, 91 days), Season 18 (December 11, 2025 – March 19, 2026, 98 days) and Season 17: Smugglers' Tide (August 14 – December 11, 2025, 119 days).
The cadence has stabilised near 13 weeks over the most recent runs, so the current end estimate follows Rare's published rhythm rather than an announced date.
The Sea of Thieves seasonal Plunder Pass costs 999 Ancient Coins (roughly $9.99 USD). Free-track Renown progression is available to all players; the Plunder Pass unlocks premium cosmetic rewards across the season's 100 Renown levels.
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Season 21 went live on September 17, 2026 and does not yet have a Rare-confirmed end date. Based on the recent ~13-week cadence it is estimated to end in late December 2026, and the countdown tracks that estimate until Rare announces the exact date shortly before the next season launches.
Sea of Thieves Season 21 launched on September 17, 2026 at 15:00 UTC, timed to coincide with Talk Like a Pirate Day.
Season 21 adds the Parley Pennant social flag, new Custom Seas options (treasure-placement presets, day/night cycle speed and a world-map ship toggle), a packed live-events calendar including the return of Last Ship Standing: Sloops, and a wide range of new cosmetics — some reserved for Pirate Legends.
The Parley Pennant is a ship flag you equip from your flag box to tell nearby pirates you want to talk — to propose an alliance, tackle challenges together, or socialise instead of fight.
Sea of Thieves seasons target around 13 weeks (~90 days). Season 20 ran 91 days, Season 19 ran 91 days, Season 18 ran 98 days and Season 17 ran 119 days — recent seasons have converged on the shorter 13-week cadence.
The Sea of Thieves seasonal Plunder Pass costs 999 Ancient Coins (roughly $9.99 USD) and unlocks premium cosmetic rewards across the season's 100 Renown levels. Free-track Renown progression is available to all players.
Sea of Thieves is available on Windows (Microsoft Store + Steam), Xbox One, Xbox Series X|S, and PlayStation 5. Cross-play is supported across every platform.
Sea of Thieves Season 21 ends at December 29, 2026 at 15:00 UTC. In local time that is 10:00 EST on Dec 29 in New York, 07:00 PST on Dec 29 in Los Angeles, 15:00 GMT on Dec 29 in London, 16:00 CET on Dec 29 in Berlin, 00:00 GMT+9 on Dec 30 in Tokyo. Every conversion is derived from the official UTC timestamp, so cities east of UTC can already be on the following calendar day when the season closes.
Last verified September 18, 2026 ggseason.com