If you want grapes that are genuinely, mouthwateringly sweet, you have to pay attention to when and how they were grown. The real sweetness build-up happens while the grapes are still hanging on the vine. As summer turns to fall, the grape vine sends all its energy into those little orbs, converting sunlight and water into sugar day by day.
Ever notice how late-season grapes, like the ones you buy in October, taste almost like candy? That’s because they had more time on the vine under cooler nights and warm days. The best way to get sweet grapes is to buy them in proper season—usually late summer through early autumn in most regions. If you buy them in February, you’re getting grapes that were shipped from halfway around the world, picked early to survive the journey. Those are rarely going to be sugary bliss.