Four species of stoneflies (Plecoptera) from an intermittent stream–perennial spring continuum were the subject of comparative life-cycle analyses. Allocapnia recta was common in each reach and exhibited univoltine-fast life cycles and determinate voltinism. Leuctra alta from the intermittent reach and a L. alta–L. sibleyi mix from the perennial reach each displayed an univoltine-fast cycle, implying that L. alta demonstrated determinate voltinism. Leuctra cf. tenuis was absent from the intermittent reach, and its growth followed a univoltine-slow cycle in the perennial reach.