This brief summarizes a study of the past labor market experiences of single mothers in the early- to mid-1990s and their subsequent employment outcomes over five years into the early 2000s. In contrast to the broader population, single mothers as a group had persistently lower rates of employment and lower earnings levels. Over time, their position in the labor market improved, with low-income single mothers in particular experiencing relatively rapid earnings growth and increased employment stability. Still, relatively large fractions of low-income single mothers continued to experience difficulties in the labor market, such as periods with no work and very low earnings when employed. It is this subset of lower-income single mothers that may be facing even greater employment and economic challenges given the current economic downturn.