Fleas don’t ordinarily climb walls because although they can crawl, the smooth surface of walls does not provide a flea a good grip and therefore is not conducive to climbing.
Instead, fleas usually reside on the surface of the ground and travel laterally, using their extraordinary jumping ability. They can jump up to 12 inches horizontally and 6 inches vertically in one leap.
A flea will usually lay in wait for a host while hiding on the ground in grass, carpet fibers, etc. When it detects the presence of a host it will leap onto its body and it time to attach itself to it.
If you live in an apartment or condo, and are concerned that a flea infestation in one of the surrounding units may climb the walls and be able to access your apartment, you can use in organic insecticides such as diatomaceous earth as a method of flea prevention.
But you most likely will not need to worry about the fleas climbing the walls and reaching your home.
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