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If you’ve made it through a Houston allergy season before, you know exactly how it starts. Late August, you wake up with a scratchy throat and blame the AC. By the second week of September you’re going through a box of tissues every two days and wondering why your eyes itch worse indoors than out. That last part is the clue most people miss. You can’t do a thing about the ragweed growing in the ditches along Highway 290 or the empty lots off Fry Road. What you can control is how much of it settles into your carpet, your pillowcase, and the top of your ceiling fan blades — and stays there for weeks, getting stirred back into the air every time someone walks through the room. What Makes Houston Allergy Season So Rough Most of the country gets a real break between pollen seasons. We don’t. Oak and pine hammer us in spring, grasses take over in summer, ragweed shows up in the fall, and then mountain cedar rolls in around Christmas. There’s maybe a three-week window in there somewhere. Then there’s the humidity. Our air holds pollen aloft longer than it does in drier climates, and the same moisture that keeps pollen floating around is what dust mites and mold need to thrive. A rainy stretch might knock the pollen count down for a day, but it drives mold spores right back up. It’s a trade, not a win. The Houston Health Department actually publishes a daily pollen and mold count pulled from a spore trap on the roof of their lab. It’s worth bookmarking. On high-count days you’ll want windows shut and shoes off at the door — more on that in a second. Ragweed: Why This One Plant Causes So Much Trouble Ragweed is the main event in fall. A single plant can put out around a billion pollen grains in a season, and those grains are light enough to ride the wind for a hundred miles. That means you don’t need ragweed in your yard to have ragweed in your bedroom. Two things worth knowing about how it behaves: It peaks in the morning. Tree and grass pollen tend to spike in the evening, but ragweed pollen levels run highest in the morning hours. If you’re opening windows to catch a cool front at 7 a.m., you’re inviting it in at the worst possible time. It doesn’t quit until a hard freeze. Ragweed season typically runs six to ten weeks in most of the country. Here, with our late first frost, it can stretch from late August clear into November. That’s a long time to be reactive about it. Stop It at the Door This is the highest-return thing you can do, and it costs almost nothing. Pollen comes into your house on shoes, clothes, hair, and pets. Every single time. Set up a landing zone by the entry you actually use — most Houston families use the garage door, not the front door — and make it easy to shed everything there. If someone in your house has been doing yard work, have them change clothes and shower before sitting on the couch. Otherwise that pollen just transfers to the upholstery and lives there. Your Bedroom Deserves the Most Attention You spend roughly a third of your life in one room. If you only have the energy to seriously clean one space during Houston allergy season, make it the bedroom. Wash bedding weekly in hot water. Not warm. Hot — around 130°F. The EPA’s guidance on controlling asthma triggers at home is direct about this: weekly hot-water washing and complete drying is what actually kills dust mites and strips out pollen. A cold-water wash mostly just moves allergens around. Encase the mattress and pillows. Zippered allergen-proof covers are somewhere between $20 and $60 and they do more for a dust mite allergy than any product you can spray. Shower before bed, not in the morning. If you’ve been outside at all, your hair is carrying pollen. Sleeping on it means eight hours of direct exposure to your face. Keep the bedroom door shut and the windows closed through fall. It’s tempting when the weather finally breaks in October, but that’s peak ragweed here. Dust Like You Mean It Dry dusting is theater. A feather duster or a dry rag lifts allergens into the air and they resettle within a few hours, usually somewhere you can’t see. Use a damp microfiber cloth, and work top to bottom so gravity is on your side: Ceiling fans deserve a special callout. People run them constantly here, which means they’re throwing whatever’s on those blades into the air all day long. Slide an old pillowcase over each blade and pull it back — the dust stays in the case instead of raining onto the bed. Floors, Fabrics, and the Stuff Everyone Forgets Carpet is a reservoir. If you have it, vacuum twice a week during allergy season with a HEPA-filter vacuum, and go slow — one pass at walking speed pulls up a fraction of what three slow passes will. Hard floors need damp mopping, not sweeping, for the same reason dry dusting doesn’t work. The commonly skipped spots: Air, Humidity, and the Mold Problem Two numbers matter here. Indoor humidity: keep it under 50%. Reducing humidity cuts down both dust mites and mold growth — mites can’t survive in dry air, and mold needs moisture to establish. In a Houston August that means running the AC even when it’s technically comfortable, and putting a dehumidifier in any room that feels damp. A $12 hygrometer will tell you where you actually stand. We covered this in more depth in our guide to fighting mold, mildew, and hard water during Houston’s summer humidity. HVAC filter: change it monthly during allergy season. Not every three months like the box says. Use a MERV 11 to 13 filter — high enough to catch pollen and mold spores, low enough that it won’t strangle your airflow. Write the date on the filter edge in Sharpie so