How hot is too hot?

How hot of a day can my newly transplanted seedlings stand?
 
I was rushing around to get my cold frame built, and today we are hitting 90 degree temps!
 
I know last season the plants saw 90 degrees and hotter, but they were plants not seedlings.
 
    My Grower Diary can be seen here:
 
 
John Deary
Home of Pumpkin Cam
 
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