Yes, flea eggs die in the dryer. A standard household dryer on high heat reaches temperatures between 130°F and 150°F, which is more than enough to kill flea eggs through a combination of extreme heat and rapid moisture loss. Even a medium setting around 120°F will typically do the job if you run the cycle long enough. For anyone dealing with a flea problem, the dryer is one of the most effective tools already sitting in your home.
Why Heat Kills Flea Eggs
Flea eggs are tiny, oval, and translucent, roughly the size of a grain of salt. They have a thin outer coating that protects them from light moisture exposure but offers almost no defense against sustained heat. When exposed to high temperatures, the warm, dry air inside a dryer rapidly pulls moisture from the eggs, a process called desiccation. Warmer air holds more moisture than cool air, which means it draws water out of small organisms far more aggressively. A dryer on high heat creates exactly this environment: hot, constantly tumbling air with very low humidity.
At temperatures above 95°F, flea eggs begin to struggle. Above 130°F, survival drops sharply. Most dryers on a normal or heavy-duty cycle operate between 130°F and 150°F, with some models reaching 175°F. That puts even a standard cycle well into the lethal range. Running the dryer for at least 30 minutes on high heat gives you a strong margin of safety.
Washing and Drying Together Work Best
The dryer alone is effective, but pairing it with a hot wash cycle makes the process even more reliable. Hot water above 140°F kills flea eggs on contact. Laundry detergent adds another layer: the surfactants in detergent can penetrate the thin outer membrane of flea eggs, disrupting them chemically in a way that plain water cannot. So a hot wash with detergent handles some eggs before items even reach the dryer, and the dryer finishes off anything that survived.
Flea eggs don’t grip tightly to fabric. Unlike some insect eggs that come with adhesive coatings, flea eggs are smooth and tend to roll or fall off surfaces easily. The mechanical tumbling action of both the washer and dryer physically dislodges many eggs, sending them down the drain or into the lint trap. This means you’re fighting flea eggs on three fronts: chemical disruption from detergent, lethal heat, and physical removal.
What to Wash and Dry
Fleas lay their eggs on your pet, but those eggs don’t stay put. They fall off within hours, landing wherever your pet spends time. That means flea eggs accumulate in predictable spots: pet bedding, your own sheets and pillowcases, blankets, couch cushion covers, throw rugs, and clothing that’s been on the floor or near pet resting areas. During an active infestation, all of these items should go through a hot wash and dry cycle.
- Pet bedding and blankets: Wash and dry on the hottest setting the fabric allows, at least once a week during an infestation.
- Your own bedding: If your pet sleeps on or near your bed, treat your sheets, pillowcases, and comforter the same way.
- Cushion covers and throws: Remove and launder anything your pet regularly lies on.
- Stuffed toys: Pet toys and children’s stuffed animals that contact the floor can harbor eggs. Most survive a dryer cycle just fine.
For items that can’t be washed, like bulky pillows or delicate fabrics, running them through the dryer alone on high heat for 30 minutes is still effective against eggs and larvae.
The Dryer’s Limits: Pupae Are Tougher
Flea eggs and larvae are relatively fragile, but the next stage in the flea life cycle, the pupa, is a different story. Flea pupae encase themselves in a sticky silk cocoon that is extremely resistant to environmental threats. Pupae can survive desiccation, many chemical treatments, and even lie dormant for up to nine months waiting for a host to come near. Borax, which effectively kills eggs and larvae by drying them out, does not kill pupae inside their cocoons.
The good news is that the sustained high heat inside a dryer does appear to overcome even this protection when items spend enough time in the cycle. But pupae are the reason a single round of laundry won’t end an infestation on its own. Some pupae will be hiding in carpet fibers, furniture crevices, and other spots your dryer can’t reach. This is why pest control experts recommend combining laundry with frequent vacuuming, which physically removes pupae and also triggers dormant ones to emerge, making them vulnerable to treatment.
How to Use Your Dryer Effectively
Set your dryer to the highest heat the fabric can handle. For sturdy items like pet beds, towels, and cotton sheets, use the heavy-duty or towel setting (140°F to 150°F). Run the cycle for a full 30 minutes at minimum. Longer is fine and provides extra assurance, especially for thick or densely woven fabrics that take time for heat to penetrate fully.
Clean your lint trap after each load. Flea eggs, larvae, and debris will collect there, and you don’t want them sitting around to potentially reinfest your home. Empty the lint directly into an outdoor trash bin or a sealed bag.
Repeat the process weekly for at least a month after you first notice fleas. The flea life cycle from egg to adult takes roughly two to three weeks under typical indoor conditions, so a single laundering session only catches what’s present that day. Weekly cycles ensure you’re catching new eggs as they’re laid, gradually breaking the cycle. Pair this with treating your pet directly and vacuuming carpets, rugs, and upholstered furniture every few days for the fastest results.