Understanding how habitat affects avian nest success is paramount, particularly when nest boxes are used. Once widespread, Thryomanes bewickii (Bewick's Wren) are presently confined to south-central and western North America. Our objective was to determine which vegetation variables influenced Bewick's Wren nesting success in nest boxes in central Texas. Between 2013 and 2014, we estimated nest success for 83 nests and measured vegetation variables surrounding nest boxes. Shrubland perimeter-area ratio negatively impacted nest success, whereas distance to nearest tree had a positive effect. Our results indicate that nests close to trees and in patches with large areas exposed to edge experienced lower nest success; these vegetation variables should be considered when using nest boxes to manage for Bewick's Wrens.