Warm weather over the past couple weeks helped crop development, but with northern growing areas still well behind average, frost damage is becoming a risk. This week’s Crop Progress report shows 21 percent of the U.S corn crop at maturity as of Sept 20, up from 12 percent a week ago, but well below the year-ago figure of 30 percent and the previous five-year average of 55 percent. In Minnesota, 4 percent is mature, compared with a five-year average of 40 percent for the same date. In North Dakota, none of the crop has reached maturity, contrasting with a five-year average of 36 percent.

Crop condition continues to look good, with 68 percent of the national corn crop rated good or excellent, compared with 69 percent last week and 59 percent for the five-year average.

For Soybeans, the agency rates 67 percent good or excellent, compared with 68 percent last week and 57 percent for the five-year average. The soybean crop is more on-schedule than corn, with 40 percent dropping leaves compared with 41 percent a year ago and a five-year average of 58 percent.

The full report is available from USDA.