Walsh dimitterede fra Catalina Magnet High School og studerede skuespil ved [[University of Arizona]], inden hun droppede ud. Walsh flyttede til [[New York City]] og sluttede sig til en komedietrup, Burn Manhattan, og arbejdede ved siden af som servitrice. <ref>{{Cite web|url=http://www.people.com/people/kate_walsh|title=Kate Walsh > Biography|publisher=[[People (magazine)|People.com]]|archivedate=29. august 2016|archiveurl=https://web.archive.org/web/20160829073341/http://www.people.com/people/kate_walsh}}</ref> <ref>{{Cite web|url=https://www.arizonafoothillsmagazine.com/features/features/4402-practice-makes-perfect-an-interview-with-kate-walsh.html|title="Practice" Makes Perfect: An Interview with Kate Walsh|last=Veric|first=Vanja|website=AZFoothills.com|language=en-US|access-date=29. december 2019}}</ref>
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