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The optimal temperature for tomato ripening is 68 - 77 degrees F, according to Purdue University. Days where that approximate temperature range is maintained for the most hours will produce the best ripening.

The chemical reactions that make tomatoes change to ripe stop functioning below the mid-60s.

The reactions that produce the most flavor and health benefits also occur in that narrow temperature range. Lycopene is not created above about 85 degrees F.

Therefore, depending on your climate zone, you might have to shelter your tomatoes from blazing sun and/or night chill during the ripening phase.

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14y ago

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