The condition ratings will be the government's first for the 2017 corn crop, which has been hampered in some areas by a wet start to the Midwest growing season.
The USDA is expected to report the corn crop as 92 percent planted, the poll showed, near the five-year average of 93 percent for this time of year. The corn crop was 84 percent seeded as of May 21, the USDA said in its last report.
The government was scheduled to release its next update at 3 p.m. CDT (2000 GMT) on Tuesday, a day later than normal due to Monday's federal Memorial Day holiday.
For soybeans, analysts expected the report to show planting as 68 percent complete, up from 53 percent the previous week and in line with the five-year average of 68 percent.
Spring wheat planting was seen as 96 percent complete, up from 90 percent last week. In its first spring wheat condition ratings of the season, the USDA was expected to rate 71 percent of the crop as good to excellent, the poll showed.
Winter wheat ratings were seen unchanged from last week, with 52 percent good to excellent.