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I subscribe to a couple of external calendar feeds from my Google Calendar (within a Google Apps account) and am curious to know how often they get updated.

For example, I have a subscription to my TripIt.com calendar. If I make a change in TripIt it can be a few days before that change shows up in my Google Calendar.

How often does Google Calendar update these feeds?

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up vote 19 down vote accepted

Google says every few hours, which in my experience means 6-24.

Currently, calendar feeds are automatically updated by Google Calendar every few hours. We understand that some users want to have the ability to refresh the calendars they added manually and we are exploring various ways to enable this.

If the calendar you're subscribing to using Google Calendar isn't refreshed after 24 hours, please send us the calendar address and the detail of the problem so that we can investigate.


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I was looking for an official source for this. I have only found support.google.com/calendar/bin/… – Mark McLaren Feb 16 '12 at 9:41
link not available – akostadinov Jul 7 '14 at 11:14
Link returns Sorry, this page can't be found – Rubén Jul 31 '15 at 17:41

The official source is https://support.google.com/calendar/answer/37100?hl=en&ref_topic=1672445

Note: It may take up to 8 hours for changes in ICS feeds to reflect in your Google Calendar.

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Now the note says It might take up to 12 hours for changes to show in your Google Calendar. – Rubén Jul 31 '15 at 17:42
That link now goes to a page that addresses a slightly different topic: Add someone else's Google calendar. – offby1 Dec 5 '15 at 16:27

I have noticed it may now take several days before changes are reflected. It looks like Google upped the time on their Calendar Help page from "every few hours" to "up to 8 hours" and now to "up to 12 hours."

Note: It might take up to 12 hours for changes to show in your Google Calendar.

Source: Add someone else's Google calendar: Add using a Link

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It seems to depend on the feed. e.g.: Facebook's event feed seems to update rather quick, while (smaller?) apps can take many more hours.

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protected by Community Sep 20 '15 at 1:44

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