The ruling on i'tikaf (spiritual retreat in the mosque) in months other than Ramadan
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Q577: The questioner asks: Is i'tikaf (spiritual retreat in the mosque) specific to the last ten days of Ramadan, or is it permissible at any time, such as the Day of 'Arafah?
A577: I'tikaf (spiritual retreat in the mosque) is permissible at any time, but it is better in Ramadan. As for designating a specific day, such as the Day of 'Arafah, this requires evidence. The Day of 'Arafah is not designated for i'tikaf (spiritual retreat in the mosque), because the Salaf (the earliest generations) did not perform i'tikaf on the Day of 'Arafah; they did not designate this day for it.
A577: I'tikaf (spiritual retreat in the mosque) is permissible at any time, but it is better in Ramadan. As for designating a specific day, such as the Day of 'Arafah, this requires evidence. The Day of 'Arafah is not designated for i'tikaf (spiritual retreat in the mosque), because the Salaf (the earliest generations) did not perform i'tikaf on the Day of 'Arafah; they did not designate this day for it.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.