ABSTRACT: The Kemp’s ridley sea turtle Lepidochelys kempii was on the brink of extinction by the mid-1980’s, but intense conservation efforts by the Bi-National Kemp’s Ridley Recovery Program led to an exponential recovery rate throughout the 1990’s and early 2000’s. However, following 2009, the population unexpectedly lost its exponential recovery trajectory. We examined potential changes in L. kempii clutch frequency as a possible factor contributing to the loss of exponential recovery. The nesting population at Rancho Nuevo, Mexico, had its clutch frequency assessed using ultrasonography and blood testosterone analysis during 3 nesting seasons (2015–2017). A significant transition in ovarian conditions was detected over each nesting season. Most turtles examined early in the nesting season were predicted to nest again, whereas most turtles examined near the end of the nesting season were predicted to have nested for the final time. Analysis of blood testosterone levels analyzed during 2016 and 2017 indicated significant differences between turtles with different ovarian conditions. We estimated a clutch frequency of 2.6 nests per season, which is consistent with similar data collected 2 decades earlier. L. kempii’s clutch frequency has remained relatively stable over the past 2 decades, suggesting the loss of the exponential recovery rate was likely not due to a decrease in clutch frequency. Our estimate of L. kempii’s clutch frequency is essential for future models to accurately assess the population size of this Critically Endangered species.