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.
The whole cycle can be as quick as 20 days or can last up to one full year; this is because the flea may be in a dormant stage for a long time. The cycle can be interrupted at any stage, but some flea control methods are more effective than others depending upon the stage the flea is in.