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Custom Seas
The current Sea of Thieves season ends on September 17, 2026. 7 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 Sep 17
| Location | Local time | Local date |
|---|---|---|
| Los Angeles | 08:00 PDT | Sep 17 |
| Chicago | 10:00 CDT | Sep 17 |
| New York | 11:00 EDT | Sep 17 |
| São Paulo | 12:00 GMT-3 | Sep 17 |
| London | 16:00 BST | Sep 17 |
| Berlin | 17:00 CEST | Sep 17 |
| Moscow | 18:00 GMT+3 | Sep 17 |
| New Delhi | 20:30 GMT+5:30 | Sep 17 |
| Singapore | 23:00 GMT+8 | Sep 17 |
| Tokyo | 00:00 GMT+9 | Sep 18 +1 day |
| Sydney | 01:00 GMT+10 | Sep 18 +1 day |
The end date is the publisher’s own timestamp, taken from an official announcement or the in-game season panel.
Every date is re-checked nightly. 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 20: Custom Seas ends on September 17, 2026 (verified September 8, 2026). Season 21 starts on September 17, 2026. Season 20: Custom Seas is the Sea of Thieves season that opened private servers to everyone: crews set their own rules, add items and enemies, assign crews freely and film with a Free Camera mode, a feature first announced as subscription-only before Rare made it free. It launched on June 18, 2026 at the Xbox Games Showcase. Rare has dated the handover to Season 21, which brings a calendar of recurring Live Events and further Custom Seas improvements, and the closing timestamp follows the 13-week rhythm the game has settled into. The Plunder Pass costs 999 Ancient Coins and unlocks premium cosmetics across 100 Renown levels, while free Renown progression is open to every player.
Sea of Thieves Season 20: Custom Seas launched June 18, 2026 and is estimated to end around September 17, 2026 — a 13-week season, matching the exact duration of Season 19 (March 19 – June 18, 91 days). 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 the estimated end while the endDateConfirmed flag remains false.
Season 20 introduces Custom Seas — private, custom-rule servers that let crews set gameplay parameters, add items and enemies, freely assign crews, and capture footage via Free Camera mode. Originally announced as a subscription feature, Custom Seas was made free for all players before launch.
Sea of Thieves seasons run roughly 13 weeks (~90 days) each. Season 19 ran March 19 – June 18, 2026 (91 days), preceded by Season 18 (December 11, 2025 – March 19, 2026, 98 days) and Season 17: Smugglers' Tide (August 14 – December 11, 2025, 119 days).
The rhythm has stabilised near 13 weeks since Season 19, so Season 20's late-September 2026 end estimate follows Rare's most recent published cadence 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 20: Custom Seas launched June 18, 2026 and is estimated to end around September 17, 2026, matching Season 19's exact 91-day (13-week) run. Rare typically confirms the precise end date only shortly before Season 21 launches, so the date is not officially confirmed yet.
Sea of Thieves seasons target around 13 weeks (~90 days). Season 19 ran exactly 91 days, Season 18 ran 98 days, and Season 17 ran 119 days. Recent seasons have converged on the shorter 13-week cadence.
Custom Seas is Season 20's headline feature — free private servers where crews set custom rules, add items and enemies, freely assign crews and factions, and use a Free Camera mode to capture footage. Originally announced as subscription-only, Rare reversed course to make it free for all players.
Season 19 ended on June 18, 2026, exactly 91 days (13 weeks) after its March 19, 2026 start, when Season 20: Custom Seas launched at Xbox Games Showcase.
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 20: Custom Seas ends at September 17, 2026 at 15:00 UTC. In local time that is 11:00 EDT on Sep 17 in New York, 08:00 PDT on Sep 17 in Los Angeles, 16:00 BST on Sep 17 in London, 17:00 CEST on Sep 17 in Berlin, 00:00 GMT+9 on Sep 18 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 8, 2026 ggseason.com