According to Gardening in the Dakotas, April 15th is planting day for beets, carrots, radishes, and onion sets.
We're going to be a few days behind this year.
"In the central portion of the great North American Continent there lies an arid and repulsive desert, which for many a long year served as a barrier against the advance of civilization. From the Sierra Nevada to Nebraska, and from the Yellowstone River in the north to the Colorado upon the south, is a region of desolation and silence." - Sir Arthur Conan Doyle, A Study in Scarlet