How do I cite a source with no date in Chicago style?

When an online source does not list a publication date, replace it with an access date in your in footnote citations and your bibliography:

Example: Chicago bibliography entry with access date
Scribbr. “How to Write a Research Paper.” Accessed June 9, 2020. https://www.scribbr.com/category/research-paper/.

If you are using author-date in-text citations, or if the source was not accessed online, replace the date with “n.d.”

Example: Chicago author-date citation with no date
(Scribbr, n.d.)