Historic & Scenic Sites in and around Washington County, MO by Esther & Gene Carroll History of Washington County Jails & Courthouses by Esther Carroll These links are a part of Carrolls' Corner - lots of Washington County History!
In a humid environment, over 60% of newly hatched fleas can live without a host for 2 months. In a cool, dry environment, only 10% will live without an immediate host. Humidity is the key to flea survival.
How Long Do Fleas Live. Flea Life Span. Fleas can live up to a year and a half when they have a food supply, the optimum temperature (70F to 85F), and ideal humidity (70%). In reality though, most live for an average of 2-3 months.