A recent visit to a field with three different planting dates showed the varied crop progress in my area.
The Useful to Usable website uses local information to predict crop development and crop maturity. The following are the predicted dates of corn development with a 100-day hybrid planted near Spencer.
Plant date silking date predicted black layer date
April 17 July 8 September 8
May 7 July 19 September 16
May 17 July 24 September 23
Plant date GDDs to date/normal current growth stage
April 17 1740/1601 milk/R3
May 7 1598/1458 blister/R2
May 17 1515/1354 blister/R2
This information shows the impact that the warm June weather has had on crop development. It appears that the replanted corn on May 17 will likely mature before September 23.
The pictures show the crop development–the two ears of corn on the far left side are the April 17 planted corn. The other two sets of ears are from the May 7 and May 17 planting date.