University Information Systems (UIS) has finalized the planned maintenance windows from August 2026 through July 2027 and posted them to the UIS Business Calendar [3].

These scheduled maintenance periods allow central IT teams to apply vendor updates, security patches and system enhancements to enterprise applications that support CU’s academic, research and administrative operations.

The UIS Business Calendar [3] 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 and update campus events by filling out the UIS Business Calendar Request form [4].

2026–27 Production Maintenance Windows

Production windows affect our live systems with real-time data used by students, staff and faculty. When there is a production window, most applications 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 are scheduled from 6 a.m. to 6 p.m.

• Aug. 9, 2026 — Sunday, 6 a.m.–6 p.m.
• Sept. 27, 2026 — Sunday, 6 a.m.–6 p.m.
• Oct. 25, 2026 — Sunday, 6 a.m.–11:59 p.m.
• Nov. 14, 2026 — Saturday, 6 a.m.–6 p.m.
• Dec. 13, 2026 — Sunday, 6 a.m.–6 p.m.
• Jan. 23, 2027 — Saturday, 6 a.m.–6 p.m.
• Feb. 13, 2027 — Saturday, 6 a.m.–11:59 p.m. Only HCM (and therefore MyLeave) will be unavailable in this prerequisite to the Time & Labor go-live.
• Feb. 26–28, 2027 — The Time & Labor go-live window runs from 5 p.m. Friday, Feb. 26 through midnight on Sunday, Feb. 28.
• March 14, 2027 — Sunday, 6 a.m.–6 p.m.
• April 25, 2027 — Sunday, 6 a.m.–Noon.
• May 23, 2027 — Sunday, 6 a.m.–6 p.m.
• June 27, 2027 — Sunday, 6 a.m.–6 p.m.
• July 24, 2027 — Saturday, 6 a.m.-6 p.m.

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 in advance in case those windows are required for a successful update.

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

• Aug. 2, 2026 — Sunday, 6 a.m.–6 p.m.
• Nov. 1, 2026 — Sunday, 6 a.m.–6 p.m.
• Jan. 30, 2027 — Saturday, 6 a.m.–6 p.m.
• May 2, 2027 — Sunday, 6 a.m.–Noon
• Aug. 1, 2027 — Sunday, 6 a.m.–6 p.m.

Nonproduction Windows

Nonproduction 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.

Nonproduction 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. The standard window runs 12 hours, from 6 a.m. to 6 p.m.

• July 10, 2026 — Friday
• July 31, 2026 — Friday
• August: No nonproduction window
• Sept. 11, 2026 — Friday
• Oct. 9, 2026 — Friday
• Nov. 6, 2026 — Friday
• Dec. 4, 2026 — Friday
• Jan. 15, 2027 — Friday
• Feb. 12, 2027 — Friday
• March 5, 2027 — Friday
• April: No nonproduction window
• May 7, 2027 — Friday
• June 11, 2027 — Friday
• July 9, 2027 — Friday

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; Sarah Layton, CU Boulder; Meredith Husk and Todd Deese, 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 [5], subscribing [6] to the Maintenance Matters newsletter [6] and bookmarking the UIS Business Calendar [3].