The adoption rate of the ramp calibration strip (RCS) has exceeded all expectations of those who developed the technology. The RCS is a method currently used to determine topdress nitrogen (N) rates in winter wheat. The RCS utilizes a series of N rates applied in sequence going from zero to a high rate (rates can change depending on the crop). The RCS can be analyzed visually or with a remote sensor at the Feekes 5 growth stage. By visually inspecting the RCS mid-season, the N rate within the RCS where biomass is maximized translates into the prescribed topdress N rate. The applicator used by Oklahoma State University applies N at a top rate of 224 kg ha-1 with 16 steps of 14 kg ha-1. As the technology is in its infancy several questions have been posed. One concern of the producers involved with the development of the RCS centered on the timing of its application. Researchers have recommended that the RCS be applied prior to planting or soon after however, producers wanted to know if the RCS could be applied later in the season as well. This study examined the impact of applying the RCS one month after planting. Four locations were utilized for this trial where at each location, two RCS were applied at the time of planting and at a time approximately one month after planting. Sensor readings were taken with a GreenSeeker ™ handheld sensor at multiple growth stages throughout the growing season. Each N rate within the RCS was harvested for grain yield data. Widening the window of application will allow producers to focus on planting with no interruptions. If the application of the RCS can be delayed, consultants and producers will have a greater opportunity to implement this cost saving technology.