In the majority of instances Latisse can be stored at room temperature. I would avoid prolonged exposure in a location where the temperature was consistently over 80F. There is no problem with storing it in your refrigerator which is usually about 40F. I would, however, caution against storing this product loosely in the refrigerator next to food; most refrigerators are probably not as clean as we would like to think. If stored in your refrigerator, you may want to consider using a plastic zip-lock bag, and allow the Latisse to warm up before applying it.
There is no need to refridgerate Latisse, just keep it in your bathroom along with your other beauty regimen to help you remember to use it every day!