Do Fleas Go Away or Become Dormant in Winter and Fall?

Adult fleas do become less active in cold weather conditions, as they prefer temperatures above 70° and relative humidity above 70%.

If you live in an area that has a cold winter, the adult fleas may die, but the flea pupa remain dormant and encased in a silken cocoon which protects them during the winter conditions.

They can remain in their cocoon for months at a time only to emerge when conditions become more favorable for them. In this way, the flea life cycle is insured to continue at the termination of winter conditions.

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