Continued timely rains will be critical to red and yellow potato production. 3:00 pm, Jun. 29, 2021 × In this Herald photo from 2020, crews work to harvest white potatoes at the Shephard farm near Crystal, N.D. Photo by Eric Hylden/Grand Forks Herald GRAND FORKS — Timely rains have sustained the red and yellow potato crops in northeast North Dakota and northwest Minnesota, but they will need more moisture as the crop matures. Most red and yellow potatoes, which are sold in the fresh market, are not grown under irrigation in the Red River Valley in North Dakota and Minnesota. That means they depend entirely on rainfall.