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Petunias can usually withstand a couple of frosts. Until the nighttime temperature dips below 26-28 degrees (F) petunias will hang in there. I have some growing in a barrel near my dryer vent. They look better right now than they did throughout most of our wet summer.
Marigolds usually croak on me after a frost, but these ‘Strawberry Blonde’ Marigolds are still going strong, and they aren’t even growing in a protected location:
And my ‘Little Henry’ Rudbeckia (perennial) plant is also continuing to bloom despite the colder temperatures:
