Fall and Winter Pest Guide for the Willamette Valley

Quick answer: Fall and winter in the Willamette Valley do not end pest season, they move it indoors. This guide collects our seasonal articles on the rodents, spiders, fall invaders, ants, termites, fleas and holiday pests that Salem, Keizer, Albany, Dallas, Woodburn and McMinnville homes deal with from September through December, with a step-by-step plan for each.

Late September: what to watch for

• Spiders in the House Every Fall? Why Oregon's September Spike Happens: Every September, Salem homes fill with big brown spiders. Here is what they are, why they are wandering, and the trap-and-seal plan that thins them out fast.
• Yellow Jackets Aggressive in Fall? Why It Happens and What to Do: September and October yellow jackets are the same insects that ignored you in June. Here is why the colony turns pushy, when it finally dies, and how to handle a nest in a wall.

October: what to watch for

• Boxelder Bugs in Oregon: Why They Cover Sunny Walls Every October: Every October the sunny side of the house turns black and red. Here is why boxelder bugs pick your walls, where they go all winter, and the timing that keeps them out.
• Stink Bugs in the House Each Fall? Why the Willamette Valley Gets Hit: The brown marmorated stink bug reached Oregon around 2004 and now fills Willamette Valley attics every October. Here is how to identify it, remove it without the smell, and keep it out.
• Ants in the House When It Rains: Oregon's Fall Ant Surge Explained: The first soaking storms of fall send odorous house ants into Willamette Valley kitchens and bathrooms. Here is why it happens, which ant you have, and why baits beat sprays.
• Fall Pest Proofing Checklist for Salem Homes: Do It Before the Rain: A printable weekend checklist for sealing your Salem home against mice, rats, spiders and fall invaders before the October rain: the gap sizes that matter, the materials that hold, and what to schedule.
• Fleas in Fall: Why Oregon's Flea Season Peaks in October: Summer's flea population peaks just as the furnace comes on. Here is why October is prime flea season in the Willamette Valley and what a plan that actually works looks like.
• Are There Dangerous Spiders in Oregon? A Calm Guide for Homeowners: Oregon has exactly one spider worth real caution, and it is uncommon around Salem. Here is how to tell widows, hobos and sac spiders apart, and what to do about a bite.
• Rat Droppings vs Mouse Droppings: Which Rodent Is in Your House?: Raisin or rice grain? Learn how to read droppings, gnaw marks, rub marks and night noises to tell rats from mice, and why the answer changes the whole plan.
• How Do Mice Get in the House? Seven Entry Points to Check This Fall: Rodent Awareness Week is observed each October, right when Willamette Valley mice head indoors. Here are the seven gaps they use most and how to check each one this weekend.
• Roof Rats in Oregon vs Norway Rats: Where Each One Hides in Your Home: One rat climbs into the attic, the other burrows under the crawl space. Learn to tell roof rats from Norway rats, what draws them to valley yards in fall, and how the plan changes.
• Mice in Car Engine Bays and RVs: How to Keep Rodents Out This Winter: A vehicle that sits still in fall is a warm, dark nest box. Here is how to spot rodents under the hood, what keeps them out of RVs and boats, and which gadgets to skip.
• How to Clean Up Mouse Droppings: Deer Mice and Hantavirus in Oregon: Deer mice carry hantavirus, and the wrong cleanup puts it in the air. Follow the CDC steps for droppings and nests, learn to tell deer mice from house mice, and know when to call.
• Rodents in the Crawl Space: Why Oregon Homes Are a Magnet: Most Willamette Valley homes sit on vented crawl spaces, and rodents love them. Here is how to tell they are under your floor, how they reach the kitchen, and what real exclusion involves.
• Cluster Flies in the House: Why Slow Flies Fill Your Windows Each Fall: Big, slow flies at the upstairs windows every fall and winter are cluster flies. Here is where they come from, how to tell them apart, and how to keep them out.

November: what to watch for

• Asian Lady Beetles in the House? How to Tell Them From Ladybugs: The orange beetles massing on your siding this fall are not the ladybugs from your garden. Here is how to tell them apart, why they come inside, and what to do about them.
• Termite Swarmers in Fall: What Winged Insects in an Oregon Home Mean: Winged insects on the window sill after a fall rain? Here is how to tell termite swarmers from flying ants, which Oregon termite you are looking at, and what an indoor swarm means.
• Carpenter Ants in Winter: Why They Stayed and What Sawdust Means: Big black ants by the sink in December are not lost. They are living in your walls. Here is how carpenter ant satellite colonies work, what the sawdust means, and how the nest gets found.
• Bugs in Firewood: How to Stack, Store and Bring Wood Inside in Oregon: Carpenter ants, dampwood termites, beetles and spiders all ride along in a Willamette Valley woodpile. Here is how to stack, store and bring firewood inside without moving them into your house.
• Silverfish in the House: The Moisture Pests of Oregon's Rainy Season: When the Willamette Valley's rain sets in, silverfish, springtails and earwigs show up in bathrooms, closets and entryways. Here is how to tell them apart and what each says about moisture.
• Crawl Space Mold in Oregon: What the Wet Season Does Under Your House: Standing water and humid air under a house feed mold and wood-decay fungi, which soften the framing that dampwood termites, moisture ants and beetles move into. Here is how to break the chain.
• Bed Bugs After Traveling: How to Come Home Without Bringing Them In: A two-minute hotel check, a homecoming laundry routine and a quiet look at the guest room after visitors leave keep holiday travel from turning into a bed bug problem.
• How to Get Rid of Pantry Moths Before Holiday Baking Starts: Indian meal moths turn up in flour, nuts and birdseed right when holiday baking starts. Here is how to find every source, clear the pantry and keep them from coming back.
• Mouse Droppings in Storage Boxes: What to Check Before You Decorate: The first trip to the attic for the holiday boxes is often the first sign of a rodent problem. Here is how to read the evidence, clean up and store smarter next year.
• Bugs in Christmas Tree Branches? What Rides in on Oregon-Grown Trees: Aphids, spiders, adelgids and the occasional mantis egg case ride in on real trees. None of them can live in your house, and a hard shake at the lot handles most of them.
• Holes in Your Sweaters? Carpet Beetle Damage vs Clothes Moths: Wool comes out of storage in November, and so do the holes. Learn how to tell carpet beetle damage from clothes moth damage, find the larvae and stop both for good.
• Cockroaches in Winter: Why German Roaches Thrive in Apartments: German cockroaches live entirely indoors, so an Oregon winter just packs them into the warmest kitchens in the building. Here is how they spread between units and what a real fix looks like.
• Is Pest Control in Winter Worth It? Why Oregon Pests Stay Active: Winter does not end pest season in the Willamette Valley, it moves it indoors. Here is what stays active from November to February and what a winter service visit actually does.

December: what to watch for

• Pest Control with Pets and Kids: What to Expect and How to Prepare: What a responsible pest control visit looks like when dogs, cats, toddlers, fish tanks or backyard chickens are in the picture, and how to prepare so the plan works.
• Commercial Pest Control in Salem: A Manager's Fall Rodent Checklist: Harvest is over, the rain is here and rodents are looking for a warm loading dock. A zone-by-zone checklist for restaurant, warehouse and office managers in the Salem area.

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