Ticks are blood-feeding arthropods which vector several pathogens that negatively impact the health of humans and livestock and, hence, are among the most costly ectoparasites in the world. Climate change, habitat fragmentation, and host population shifts are some of the factors which influence tick abundance. Specifically, extreme temperatures may limit both the geographic distribution and abundance of tick populations. Although several studies have investigated the effects of extreme temperature on mobile life stages of ticks, data on egg thermal tolerances are uncommon. In this study, we measured the influence of cold-shock (-12.5 to -27.5^oC), fluctuating temperatures, cold acclimation (0^oC; then -15 to -27.5^oC), and heat shock (42 to 45^oC) on the eggs of four Ixodid tick species: Amblyomma maculatum, Ixodes scapularis, Dermacentor variabilis and Rhipicephalus sanguineus. We exposed the eggs to temperature treatments during both early and late stages (before and after fecal pellet observation) and assessed larval emergence. More larvae hatched from eggs exposed to stressful temperatures during later development stages compared with those exposed in early stages. In addition, we showed that differences in hatching timing and success are significantly dependent on the severity of temperature treatments and vary among tick species. This study provides a baseline for understanding how the timing and severity of extreme temperature events may influence tick egg development and subsequent population dynamics.