Finding Suitable Spawning Habitats: iSSH uses a compilation of data products during the study range 2003-2018, and includes Grunion Greeters citizen science data, in situ measurements, and NASA Earth Observations. The Grunion is a fish endemic to California with a range historically in Southern California (San Diego to Santa Barbara), and a more recent expansion northward to Monterey and San Francisco in the past three decades. During a "grunion run", the fish spawns on the beach, riding the waves onshore to lay its eggs in the sand. This MATLAB app matches user input of chlorophyll-a levels, ocean temperature, and upwelling indices, to the most the similar conditions at a recorded grunion run from available data. It may be used to get an idea of the potential size of future grunion runs based on the conditions during past runs. The application was created using MATLAB's App Designer.