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The color of the vine also indicates when to harvest Concord grapes. Throughout the growing season, the vine and stems are a light to medium green. When the vine and stems begin to turn to a light then medium brown, it means the grapes are ripening and ready to harvest.
Grapevines that are pruned regularly will generally produce bigger, sweeter fruit than vines that are not. The best time to prune grapevines is in February, but it can be done later. Vines pruned later in the spring will bleed more (exude sap from the areas that were cut).