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At all life stages, Fleas can't survive temperature above 95 degrees. And below 35 degrees F. So the 105 degree F is good for the purpose. But its better to understand their life cycle, to have effective result. the following infographics explain this- @https://www.ecoshieldpest.com/re...
Report Abuse. Fleas generally don't survive past 100 days, even if they live on a host (the animal on which they feed). However, without a host, they have no food source, and may die between 2 and 14 days. The same can't be said for flea eggs and larvae, which do not require a host and can reach high populations. Adult Flea 1. Once an adult flea is deprived of its host, it will basically starve to death. It will generally die between 2 and 14 days.