Climate warming yields potentially longer growing seasons in energy-limited portions of the Earth, offering potential benefits to ecological and agricultural systems. Species receptive to thermal accumulation during the spring may break dormancy and begin development earlier in the year; however, advances in phenological timing may leave early-stage vegetation growth vulnerable to cold damage when hard freezes follow green-up resulting in a false spring. With continued widespread warming of the global land surface in the coming decades, it is relevant to examine how false springs may change under various representative concentration pathways. Spatiotemporal patterns of green-up dates, last spring freezes, and false springs are modeled across the contiguous United States from 1950 to 2099 using downscaled climate projections. Results indicate widespread advancement in the timing of green-up and last spring freeze dates over the period, with last spring freezes trending earlier in the year relative to green-up. Although regionally variable, these changes result in an overall reduction of false springs across the US.