Smith (forearm) was scheduled to begin a rehab assignment at Triple-A Pawtucket on Tuesday, but the game has been postponed due to weather, Pete Abraham of the Boston Globe reports.
Smith will have his first appearance delayed by a day, but he figures to remain on a similar timeline, targeting an early-May return. The expectation is that the right-hander will need three appearances before making his Red Sox debut after starting the year on the DL.