San Ysidro District AVA

{{Use mdy dates|date=May 2021}}

{{Infobox Wine Region

| name = San Ysidro District AVA

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| type = American Viticultural Area

| year = 1990{{cite web|url=https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=&SID=03f124cf6511695298349ba98eebdebe&mc=true&r=SECTION&n=se27.1.9_1130|website=Code of Federal Regulations |title=§ 9.130 San Ysidro District |format=Title 27: Alcohol, Tobacco and Firearms; Part 9 — American Viticultural Areas; Subpart C — Approved American Viticultural Areas |accessdate=January 25, 2008}}

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| country = United States

| part of = California, Central Coast AVA, San Francisco Bay AVA, Santa Clara Valley AVA

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| total size = {{convert|2340|acre|ha|0}}{{cite web |website=Wine Institute |date=2008 |url=http://www.iwineinstitute.com/ava/avabystate.asp |title=American Viticultural Areas by State |archiveurl=https://web.archive.org/web/20080127115948/http://www.iwineinstitute.com/ava/avabystate.asp |archivedate=2008-01-27|df=mdy-all}}

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| grapes = Merlot{{cite web |website=Appellation America |date=2007| url=http://wine.appellationamerica.com/wine-region/San-Ysidro-District.html |title=San Ysidro District (AVA): Appellation Profile|archiveurl=https://web.archive.org/web/20160324070645/http://wine.appellationamerica.com/wine-region/San-Ysidro-District.html|archivedate=2016-03-24|accessdate=January 25, 2008|df=mdy-all}}

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The San Ysidro District AVA is an American Viticultural Area located in Santa Clara County, California. It is part of the larger Santa Clara Valley AVA and is located in the foothills of the Diablo Range. San Ysidro District is significantly cooler than other parts of Santa Clara Valley. Cooling breezes can reach the area via the Pajaro River which cuts into the nearby foothills.