Patch Tuesday Calendar
Rolling 12-month calendar of Microsoft Patch Tuesday dates with links to the corresponding MSRC monthly advisory releases.
Microsoft ships its coordinated monthly security updates on the second Tuesday of every month — the release the industry calls Patch Tuesday. For change managers this is the single most predictable spike in patching, reboots, and change-request volume in the calendar, and pretending it will not happen is how organizations end up freezing the wrong week or scheduling a business-critical release directly into a mandatory reboot window. This tool shows the next twelve Patch Tuesday dates in rolling order, marks the upcoming one, and links each month to its MSRC "Release Notes" page so you can see the exact CVEs, KB numbers, and affected products the moment the advisory drops. The dataset is generated deterministically (second Tuesday of each month) so it stays accurate even when the site is offline from the live MSRC feed. Use it to lay out change-freeze windows, plan pilot rings, and set stakeholder expectations for maintenance downtime. Add the calendar URL to your CAB agenda template so no one has to look it up again.
| Month | Patch Tuesday | MSRC release notes |
|---|---|---|
| August 2025 | Tuesday, August 12, 2025 | View advisory |
| September 2025 | Tuesday, September 9, 2025 | View advisory |
| October 2025 | Tuesday, October 14, 2025 | View advisory |
| November 2025 | Tuesday, November 11, 2025 | View advisory |
| December 2025 | Tuesday, December 9, 2025 | View advisory |
| January 2026 | Tuesday, January 13, 2026 | View advisory |
| February 2026 | Tuesday, February 10, 2026 | View advisory |
| March 2026 | Tuesday, March 10, 2026 | View advisory |
| April 2026 | Tuesday, April 14, 2026 | View advisory |
| May 2026 | Tuesday, May 12, 2026 | View advisory |
| June 2026 | Tuesday, June 9, 2026 | View advisory |
| July 2026 | Tuesday, July 14, 2026 | View advisory |
Dates are generated as the second Tuesday of each month, consistent with Microsoft's published cadence. Advisories: Microsoft Security Response Center (MSRC) release cadence.
About this tool
Patch planning becomes harder when the regular release rhythm is remembered informally and scattered across team calendars. This calendar provides a rolling view of Microsoft Patch Tuesday dates and links back to the MSRC advisory material. It also makes planning assumptions easier to review. Release managers can use it to reserve evaluation time, avoid stacking unrelated production changes, and make sure application owners know when updated packages or security guidance are likely to enter the queue.
Treat the calendar as a planning anchor, not a complete patch program. The scheduled date does not tell you which products will be affected, whether a particular update applies, or how quickly a change can move through testing. Open the relevant MSRC guidance after publication, assess the affected estate, and coordinate with vendor dependencies and local freeze periods. Microsoft can issue out-of-band security updates, so an operational watch process should not wait for the next scheduled Tuesday.
How to read the output
- Reserve assessment and testing capacity around the displayed release date.
- Follow the MSRC link to review published product-specific advisory details.
- Separate the scheduled release date from each team's local deployment deadline.
- Monitor closely for out-of-band releases during critical operating periods each month.
What this does not tell you
- Scheduled dates support planning, but Microsoft may issue out-of-band security updates outside the regular monthly release cycle.
- The calendar does not identify which updates apply to an organization's products, build levels, or managed endpoints.
- MSRC advisory publication does not replace testing, deployment-ring decisions, or change approval under local policy.
Data sources
- Microsoft monthly security update release cadence
- Microsoft Security Response Center Security Update Guide
Free to use, no account required, and nothing you enter is transmitted to this site — the tool runs entirely in your browser.