Planned maintenance windows from August 2025 through July 2026 have been scheduled and posted to the University Information Services Business Calendar.

The UIS Business Calendar is used to plan maintenance events and to document important campus and business cycle dates. The calendar allows departments, faculty, and staff to identify enterprise system outages and plan accordingly and for UIS to avoid critical campus dates.

Campuses and teams can add or update campus events by filling out the UIS Business Calendar Request form.

Production Windows

Production windows affect our “live” systems with real-time data used by students, staff and faculty. When there is a production window, most live systems will not be available to users unless the production communication for that window states otherwise. Windows outside of the normal 12-hour maintenance window time or day of the week are in bold below. Otherwise, windows last from 6 a.m. to 6 p.m.

• Saturday, July 26, 2025 — Production Maintenance and Critical Patch Update
• Sunday, Sept. 28, 2025 — Production Maintenance and Patching + PT: 6 a.m. – midnight
• Sunday, Oct. 26, 2025 — Production Maintenance and Critical Patch Updates
• Sunday, Nov. 16, 2025 — Production Maintenance
• Sunday, Dec. 14, 2025 — Production Maintenance
• Sunday, Jan. 25, 2026 — Production Maintenance and Critical Patch Updates 6 a.m. – Noon
• Sunday, Feb. 22, 2026 — Production Maintenance
• Sunday, Mar. 29, 2026 — Production Maintenance
• Sunday, Apr. 26, 2026 — Production Maintenance and Critical Patch Updates 6 a.m. – Noon
• Saturday, May 30, 2026 — Production Maintenance
• Sunday, Jun. 28, 2026 — Production Maintenance
• Saturday, July 25, 2026 — Production Maintenance and Critical Patch Updates

Contingency Windows

Contingency windows follow regularly scheduled maintenance windows that involve Critical Patch Updates (security patches) in case we are unable to complete the update in the original window. We do not anticipate using contingency windows, but prefer that campuses are aware well in advance in case those windows are required for a successful update.

The confirmation or cancellation of the contingency window is announced on the Monday prior to the contingency window.

• Sunday, Aug. 3, 2025 — Contingency Production Maintenance and CPU Patch, 6 a.m. – 6 p.m.
• Sunday, Nov. 2, 2025 — Contingency Production Maintenance and CPU Patch, 6 a.m. – 6 p.m.
• Sunday, Feb 1, 2026 — Contingency Production Maintenance and CPU Patch, 6 a.m. – Noon
• Sunday, May 3, 2026 — Contingency Production Maintenance and CPU Patch, 6 a.m. – Noon
• Sunday, Aug. 2, 2026 — Contingency Production Maintenance and CPU Patch, 6 a.m. – 6 p.m.

Non-production Windows

Non-production maintenance windows affect the testing and development environments. These mirrored systems allow UIS staff to develop new features and functionalities and test them before they are moved to production for real-time access by CU’s students, faculty and staff.

The standard window runs 12 hours, from 6 a.m. to 6 p.m. Non-production maintenance windows usually occur on Fridays two weeks before production maintenance windows to allow time to test updates before activating them in the live environment.

• Friday, July 11, 2025
• August 2025 —No non-prod window
• Friday, Sept. 12, 2025
• Friday, Oct. 10, 2025
• Friday, Nov. 7, 2025
• Friday, Dec. 5, 2025
• January 2026 — No non-prod window
• Friday, Feb. 6, 2026
• Friday, Mar. 13, 2026
• April 2026 — No non-prod window
• Friday, May 8, 2026
• Friday, June 12, 2026
• Friday, July 10, 2026

How the Maintenance Schedule is developed

Each year, UIS partners with campus and System Administration leaders to determine dates when enterprise and business systems can be unavailable for maintenance. The University of Colorado is a busy university, so it is impossible to avoid all business cycles, but we strive to have minimal impact on campus operations.

At the beginning of the spring semester, UIS Communications coordinates a team that includes representatives from UIS Applications, Quality Assurance, CU-SIS, HCM, Research Administration, Infrastructure and IT Service Strategy. Together, they draft a proposed schedule.

Early drafts of the maintenance schedule for the following academic year are then shared with leaders and liaisons from Finance, Procurement Service Center, Employee Services, UIS leadership and campus student services. This year, UIS would like to thank the following for their time and contributions to the maintenance schedule: Todd Casey, UCCS; Susan Layton, CU Boulder; Meredith Husk, CU Denver; Charity Moser, CU Anschutz; Chris Rasay, Procurement Service Center; Calvin Anderson, University Controller; Sharon Bishop, Diane Wiederspahn, Jennifer Bosma and Carolyn Proctor, Employees Services; and the UIS leadership team.

Unplanned maintenance windows may occur if an emergency update is needed due to a security risk.

Stay updated on all maintenance window communications, including updates and changes, full details on affected systems, and more by visiting the Maintenance Matters blog or subscribing to the Maintenance Matters newsletter.