Burned up Zinna's
Several possibilities come to mind. Did this discoloration occur right after you moved the plants outdoors? They may not have been hardened off, and could have gotten sunburn and/or windburn. It's a good idea to place new transplants in a protected location out of the sun for a week or so before putting them in their final location outdoors.
Another possibility is a touch of late frost. Zinnias are quite sensitive to cold temperatures, and if it the temperature got down into the upper 30s, they may have suffered from frost injury.
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