With an expected low of 29°, would you cover potato plants that are just starting to emerge and are no more than an inch tall?
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I would. All the nightshades are very frost tender. But if you can’t reach them all I think there’s a decent chance the below-ground growth would still push them. (I don’t grow spuds any longer because there are so many good and cheap ones here.)
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If your soil is loose and friable, you could rake it onto them. It sounds like something I would do. 
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I put some loose straw about 6” deep over them. It was the easiest thing I could do.
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I would hill them. I hill anyway several times as they just emerge.
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What does the dew point have to do with plants and cold?
It’s a marker of about how cold it can potentially get. With calm winds and no clouds, the temp usually falls to close to the dewpoint.
Theee are some clouds forecast to move in after midnight, though.
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We used to grow them commercially and would plant 45 days before last freeze. They do just fine.
Sorry to disagree, but the dew point is a measurement of how much water vapor is in the air and how cool it NEEDS to get to begin condensation and cloud/fog formation. Dew point is not an indication of how cold it will get.
The larger the difference between temperature and dew point will indicate clearer skies and lead to more radiative cooling, leading to a larger temperature drop, but just because a dew point is a certain temperature doesn’t mean the temperature will get that low.
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