Sonoran Desert Institute

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Billing, Payment Plan, Tuition Balance, Payment Processing Financial Services:
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Sonoran Desert Institute is open throughout the year to serve current, prospective, and prior students. SDI supports a remote workforce, with employees working from multiple time zones. Advisors and faculty provide their students with typical working hours to establish expectations and optimize communication.

Administrative Office Hours

Monday – Friday 9:00 am – 5:00 pm (Arizona Time)

Note that Arizona does not switch to Daylight Saving Time. Therefore, the office hours remain Mountain Standard Time year-round, which aligns with Pacific Daylight Time during the period in which daylight savings time is followed.


The online classroom is available during holidays. However, the administrative offices will be closed during the holidays listed below. When the holidays fall on the weekend, SDI will typically align with the federal observance, usually the Friday prior or the Monday following such holiday. Current students will be informed of specific office closures by email and/or website updates.

  • New Year’s Day
  • Martin Luther King Day
  • President’s Day (Washington’s Birthday)
  • Memorial Day
  • Independence Day
  • Labor Day
  • Columbus Day
  • Veterans’ Day
  • Thanksgiving
  • Thanksgiving Friday
  • Christmas Eve
  • Christmas Day
Academic Calendar

SDI’s online classroom is generally available 24 hours a day, 7 days a week to provide the most flexibility for students to work at their convenience. Students will be notified in advance of any scheduled down times for system maintenance. Faculty hours and availability vary. Students will be provided with general guidelines by faculty for each course during their program of study.