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.
In homes, flea larvae live for 7-11 days before pupating. In ideal environments, they can fully develop in 4-7 days. In poor conditions, it may take 28-45 days for flea larvae to mature. How quickly they develop depends upon ambient temperature, relative humidity, and food availability.