Pregnant women, postpartum women, and infants are at high risk for complications from influenza. From October to November 2012, Text4baby, a free national text service for pregnant women and mothers of infants aged <1 year, implemented a module of interactive messages encouraging maternal influenza vaccination. A program evaluation examined whether a text-based reminder or tailored education improved self-reported influenza vaccination or intent to be vaccinated later in the influenza season among Text4baby participants.