Perhaps the biggest revelation in the latest USDA crop planting report was the number of prevented plant acres.

About 19.4 million acres of crops were not able to be planted by farmers this year, according to the USDA, marking the most prevented plant acres ever reported.

Fields were the most empty in the Midwest, where more than 70 percent of the prevented plant acres were reported.

A late spring and unrelenting rain kept farmers from planting on time. Those who did manage to get a crop in, got it planted later than usual.

There are other projections out there as well, including one from AccuWeather, which predicts the lowest U.S. corn yield in seven years. Another report from Indigo Ag predicts yields much lower than the USDA's. 

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So who can we trust? 

Ryan Miller, University of Minnesota Extension educator, said that each projections report comes from a different kind of methodology. None of them should be trusted as entirely accurate. 

"Until it's in the bin, you're really just kind of guessing," said Miller of the reports. "Because a lot of things can happen between now and the harvest." 

He said things like lodging and tar spot on corn, or wind storms could affect yields in the weeks leading up to harvest. A lot depends on if we get weather with adequate precipitation or if things really dry out, said Miller. 

"So I'm cautious," he said of the projections. "If we went out two weeks from now and looked at a bunch of fields, we might have more certainty." 

Weather has been cooperative in the past few weeks in Minnesota, but Miller said the effect on crops from a cold and wet spring is still there. 

"Realistically a lot of farms (in southeast Minnesota) were planted not in an optimal time, and not under optimal conditions," said Miller.

Most farmers in the Upper Midwest who do have corn and beans in their fields are hoping rain continues to hold off, allowing the crops to mature and dry. A late killing frost could be the best thing to happen to farmers this year.