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.
Flea pupae can also stay in their cocoons for up to a year, waiting to sense the body heat and vibrations that signal the presence of nearby hosts. So when you go on vacation, the fleas don't starve to death -- they simply wait for you and your pets to come back.