Obtaining basic life history information, such as age and size at maturity, for invertebrates subject to harvest is an important first step in assessing population status. In estuaries of the southeastern United States, the gastropod Cinctura hunteria (banded tulip, Perry, 1811) is regularly collected for the shell and aquarium trades; however, basic life history information is sparse. The objective of this study was to determine the growth rate of C. hunteria using three methodologies: population length-frequency, mark-recapture studies, and laboratory growth. Age and size at maturity were also verified through histological analyses. Monthly surveys were conducted from October 2018 to October 2020 at two sites in Tampa Bay, FL, within the core of the species' range. Two models were compared per methodology to define growth rate. First, population metrics were used to estimate von Bertalanffy growth parameters of asymptotic length (L_∞) and Brody's growth coefficient (K) using Gaussian mixture (GMM) and electronic length-frequency (ELEFAN) models. Next, mark-recapture and laboratory growth data were used to estimate L_∞ and K using a Bayesian Fabens method and the Wang growth model. The average estimated age at maturity for male and female C. hunteria was 2 y of age at similar but slightly larger sizes for females (42.2 mm) than males (38.2 mm). Based on the Tampa Bay populations studied, the GMM and BFa models were the most biologically plausible for maximum age and size and for predicting growth increments, and together had an average L_∞ of 81.3 mm and K of 0.112 y^–1. The mean shell length observed (51.6 mm) was estimated to be 3-y-old, the average maximum age observed on the reefs was estimated as 4-y-old, and typical individuals were estimated to contribute reproductively over two to three breeding seasons during their lifetime. Understanding the age and size at maturity of individuals and their potential reproductive contribution should be considered when developing and implementing marine life management practices and regulations.