Deployments/Yearly calendar/2026
See also the calendar for 2025.
| What | When | Deployment decision | What happened? |
|---|---|---|---|
| New Year's Day | Thu 1 Jan | No deploys | ✅ No MW deploys |
| Martin Luther King Jr Day | Mon 19 Jan | No UTC Late backport window | ✅ No MW deploys |
| U.S. Presidents' Day | Mon 16 Feb | No UTC Late backport window | ✅ No MW deploys |
| Northward Switchover: Services + Traffic | Tue 24 Mar | Deployments locked during switch | ✅ No service deploys during switch |
| Northward Switchover: Mediawiki | Wed 25 Mar | Deployments locked during switch | ✅ No MW deploys during switch |
| Earth Day | Wed 22 Apr | No deploys on 22 Apr
No train (wmf.25), week of 20 Apr |
✅ No MW deploys |
| U.S. Memorial Day | Mon 25 May | No UTC Late backport window | ✅ No MW deploys |
| Juneteenth | Fri 19 Jun | No deploys as normal | ✅ No MW deploys |
| U.S. Fourth of July Holiday (observed) | Fri 3 Jul | No deploys as normal | ✅ No MW deploys |
| International Day of the World’s Indigenous Peoples (observed) | Mon 10 Aug | No deploys | ❌ One MW-ish deploy |
| U.S. Labor Day | Mon 7 Sep | No UTC Late backport window | ✅ No late MW deploys |
| Southward Switchover: Services + Traffic | TBD ~23 Sep | Deployments locked during switch | |
| Southward Switchover: Mediawiki | TBD ~24 Sep | Deployments locked during switch | |
| Columbus Day (also Indigenous Peoples' Day) | Mon 12 Oct | No UTC Late backport window | |
| Veterans' Day | Wed 11 Nov | No UTC Late backport window | |
| US Thanksgiving | Thu 26 Nov | No UTC Late backport window | |
| Day-after-Thanksgiving | Fri 27 Nov | No deploys as normal | |
| Release Engineering off-site | Mon 9 Nov - Fri 13 Nov | No train; deploys as normal | |
| End of Year Holiday | Thu 24–Fri 01 Jan 2027 | No trains or deploys |