Deployments/Yearly calendar
Below is an extended forecast for the days on which deployment slots on the calendar won't be made and weeks in which the deployment train will not run.
Calendar
This is a naïve estimate based on the idea that any WMF holiday that does not fall on a Monday or a Friday makes the week a non-train week.
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 | |
| U.S. Presidents' Day | Mon 16 Feb | No UTC Late backport window | |
| Northward Switchover: Services + Traffic | TBC ~18 Mar | Deployments locked during switch | |
| Northward Switchover: Mediawiki | TBC ~19 Mar | Deployments locked during switch | |
| Earth Day | Wed 22 Apr |
No deploys on 22 Apr
No train (wmf.25), week of 20 Apr |
|
| U.S. Memorial Day | Mon 25 May | No UTC Late backport window | |
| Juneteenth | Fri 19 Jun | No deploys as normal | |
| U.S. Fourth of July Holiday (observed) | Fri 3 Jul | No deploys as normal | |
| International Day of the World’s Indigenous Peoples (observed) | Mon 10 Aug | No deploys | |
| U.S. Labor Day | Mon 7 Sep | No UTC Late backport window | |
| 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 | TBD | No train ; deploys as normal | |
| End of Year Holiday | Thu 24–Fri 01 Jan 2027 | No trains or deploys |