The best time to visit Corsica for wine tasting is when the weather is mild and the grapes are ripe. If you visit Corsica in October, you might be able to attend a harvest festival and sample some of the wines before they are bottled. On the other hand, if your trip falls between April and June, it’s likely that most of the grapes will have already been harvested. Either way, you will have a great time visiting Corsica at any time of the year.
Another important factor is whether or not there is an event happening during this period such as a harvest festival or winemakers conference—that you would like to attend while in Corsica.