It's getting pricier to throw some ribs and burgers on the grill. And you can blame the surging price of corn.

That's because much of the corn grown in the U.S. is used as animal feed. And "we're using $6 corn to feed hogs right now," up from about $4 last year, says Michael Swanson, an agricultural economist at Wells Fargo in Minneapolis. "Either the hog guy is going to go out of business or you're going to pay more for pork." So if you "want barbecue ribs," he adds, "you're going to have an extra $10 attached to it."

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