When Do Fleas Come Out?

Fleas are most active in warmer months, with temperatures in the 60s to 75degF. In some parts of the country, the first fleas will begin to emerge as early as late February. The second season, which lasts from late summer to late fall, will also bring a high concentration of fleas. The first stage of flea life cycle involves the development of an egg into an adult flea. This life cycle requires the flea to find a suitable host. The pupae stage will remain in a cocoon until the temperatures are warm enough to hatch.

The life cycle of fleas can last anywhere from several weeks to two months. This depends on climate and the types of fleas in the area. Fleas are able to lay eggs on human and animal hosts, and these eggs can be spread throughout the house by pets. The eggs fall into bedding, carpets, and other places. Because they are so small, flea eggs are often unnoticed until they become adult fleas.

The number of fleas on your pets is 70 percent higher in the fall than in spring. This is due to the increase in rainfall, which causes a “flea surge.” As temperatures remain around 70 degrees, fleas will be thriving and reproducing rapidly. A female flea will lay as many as 28 to 50 eggs a day.