What time of year are fleas the worst?

By Ellie

November 24, 2025

Fleas are typically worst during the warm, humid months of late spring through to early autumn. They thrive when temperatures range between 21 - 30 degrees Celcius and when moisture levels are high. In the UK, flea numbers peak from May to September, but this can extend right through to October if it's mild enough.

Pets that spend time outdoors are more likely to get infested with fleas, and a pet with fleas = a house with fleas. In order to not get fleas, you must regularly treat your pet with preventive flea treatments, frequently clean your home and treat your home with flea spray when necessary. Itch Flea Treatment for Cats and Itch Flea Treatment for Dogs targets all stages of the flea life cycle to kill fleas and their eggs, to prevent them from coming back. Use vet-approved flea treatment, like Itch Flea to ensure full protection.

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What time of year are fleas the worst?