Is iCloud Calendar encrypted?
No. Apple can read your iCloud Calendar, even with Advanced Data Protection on. Invites go out to other people as normal email.
Checked on 25 October 2026 against 3 sources.
Made by Secria, which is building Secria Workspace. We grade every app by the same rules. How we check
- Your eventsApple can read itApple says calendars are built on the CalDAV standard, which has no built-in end-to-end encryption, so Apple keeps the keys even with Advanced Data Protection.1
- Invites to othersApple can read itInvitations go out by email, so the other person's provider can read them as well as Apple.1, 2
- Post-quantumNot yetNo post-quantum protection announced as of 25 October 2026.
- Who holds the keys
- Apple keeps them in its data centers, even if you turn on Advanced Data Protection.
- What Apple can still see
- Everything in your calendars, which Apple says it can hand over under a US search warrant, with or without Advanced Data Protection.
Email is worth checking next: Gmail, Outlook and iCloud Mail can all read your mailbox. See which email services can.
Is iCloud Calendar end-to-end encrypted?
No. Apple's iCloud security overview lists Calendars as encrypted in transit and on the server, with Apple holding the keys1. Apple explains that contacts and calendars are built on CalDAV and CardDAV, standards with no built-in support for end-to-end encryption1.
Does Advanced Data Protection encrypt my calendar?
No. Advanced Data Protection raises the number of end-to-end encrypted iCloud data categories to 25, but Calendars, Contacts and iCloud Mail keep Apple as the key holder1.
Apple's guidelines for US law enforcement say calendar content may be provided under a search warrant, with or without Advanced Data Protection3.
Are iCloud Calendar invites private?
Not from Apple, and not from your guests' email providers. When you add invitees on iCloud.com, Apple sends them invitation emails2. Those emails can be read like any other email by each guest's provider.
How iCloud Calendar compares
Sorted by how many parts are sealed by default, then by how many can be. Ties go A to Z.
Sources
- iCloud data security overview (published 5 January 2026), Apple. Read on 25 Oct 2026.
- Invite people to a calendar event on iCloud.com, Apple. Read on 25 Oct 2026.
- Legal Process Guidelines: Government & Law Enforcement within the United States (October 2025), Apple. Read on 25 Oct 2026.
Changes to this answer
- First published.