CHICAGO, Feb 16 (Reuters) - U.S. wheat futures touched a one-week high on Tuesday, rising nearly 3% on fears that frigid temperatures in the breadbasket of the Plains may have damaged winter wheat, analysts said.

Corn and soybean futures followed the firm trend, with a strong U.S. soy-crushing pace and worries about harvest delays in Brazil lending support.

As of 12:58 p.m. CST (1858 GMT), Chicago Board of Trade March wheat futures were up 17-1/4 cents, or 2.7%, at $6.54 a bushel after reaching $6.56-1/2, the contract's highest since Feb. 9.

CBOT March corn were up 11-1/4 cents at $5.50 a bushel and March soybeans were up 10-3/4 cents at $13.82-3/4 a bushel.

Wheat led the advance as traders focused on temperatures dropping below 0 degrees Fahrenheit (-18 Celsius) as far south as west-central Texas. Winter wheat was seen as vulnerable to the extreme cold in areas lacking adequate snow cover.

"We won’t know the level of losses from this outbreak for several weeks...but 30% of the U.S. hard red winter wheat was vulnerable to significant freeze damage over the weekend," Arlan Suderman, chief commodities economist for StoneX, said in a client note.

Hard red winter wheat is the largest U.S. wheat class and Kansas is the top producer of the grain, which is milled into flour for bread. The extreme conditions likely stressed the region's cattle herd as well, Suderman noted.

Soybean futures drew support from a larger-than-expected monthly soy-crushing figure from the National Oilseed Processors Association, which said its U.S. members crushed 184.654 million bushels of soybeans in January.

The tally was the second-largest for any month and topped an average of analyst estimates for 183.1 million bushels.

"NOPA supported the market. We rallied a little bit off that," said Jack Scoville, analyst with the Price Futures Group in Chicago.

Brisk domestic and export demand for U.S. soybeans has eroded stockpiles and the slow arrival of Brazil's new crop has fuelled supply concerns.

Thousands of trucks loaded with grains for export were stranded close to a cargo transshipment station in northern Brazil, oilseeds trade group Abiove said on Saturday.

(Additional reporting by Gus Trompiz in Paris and Naveen Thukral in Singapore; Editing by Devika Syamnath, Sherry Jacob-Phillips and Mark Heinrich)