Magnet schools are one of the largest sectors of choice schools in the United States. In this study, we explored whether there is heterogeneity in magnet school effects on student achievement by examining the effectiveness of 24 recently funded magnet schools in 5 school districts across 4 states. We used a two-step analysis: First, separate magnet school effects were estimated using a propensity score matched regression approach to address selection bias. Second, the magnet effects were synthesized across schools using a multi-level random-effects meta-analytic framework. Results indicated that there is significant variation in magnet school effects on student outcomes, with some magnet schools showing positive effects, and others showing negative effects. This variation can be explained by program implementation and magnet support. Demographic Statistics for Matched Samples by District is appended.