If you’ve ever noticed a swarm of little black-and-red bugs hanging out on the sunny side of your home every fall, congratulations — you’ve got boxelder bugs. They’re like that one group of friends who love to show up uninvited, never bring snacks, and don’t know when to leave.
The good news? They’re mostly a nuisance. The better news? Boise Pest Pros (that’s us!) knows exactly how to evict these freeloaders.
And we’re not just winging it — this information is backed by research from the University of Idaho’s College of Agricultural and Life Sciences.
Boxelder bugs partying on your siding every fall—uninvited, of course
Meet the Boxelder Bug: Idaho’s Unofficial Fall Guest
Boxelder bugs — scientifically known as Boisea trivittata and Boisea rubrolineata — are oval-shaped, about ½ inch long, and easy to spot with their red racing stripes on a black body.
While they don’t chew, sting, or transmit diseases, they do:
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Swarm in large numbers around windows, doors, and siding
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Sneak indoors through tiny gaps
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Leave behind odors and stains if squished (pro tip: don’t squish)
Idaho is home to two boxelder bug species. They act the same, they cause the same headaches, and they both seem to think your house is an Airbnb with no checkout time.
Why Boxelder Bugs Love Your Yard
These pests are drawn to boxelder trees (Acer negundo) — especially the female, seed-bearing trees. They also enjoy maple trees and sometimes ash.
They feed mostly on seeds and sap, hanging out on the trees all summer. But when the temperatures drop, they go looking for warm, dry places to ride out the winter… and your home fits the bill perfectly.
Logan, Owner of Boise Pest Pros: Proudly local, family-operated, and protecting Boise homes from pests.
A Seasonal Cycle (and a Predictable Invasion)
Boxelder bugs in Idaho typically:
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Spring: Emerge from their winter hiding spots once temps hit around 70°F
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Summer: Feed and breed on boxelder and maple seeds
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Fall: Migrate toward sunny walls and foundations
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Winter: Sneak indoors to hibernate
This is why you usually see them en masse in September and October across the Treasure Valley — Boise, Meridian, Nampa, Caldwell, and Eagle are prime hot spots.
Just a boxelder bug enjoying a scenic tree-side view in Boise
How to Prevent Boxelder Bugs (Without Losing Your Mind)
Here’s what actually works:
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Seal entry points: Caulk around windows, doors, and siding.
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Fix screens & vents: Keep gaps covered with fine mesh.
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Trim or remove seed-bearing boxelder trees: No seed buffet, no party.
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Clean up seeds early in the year: Bugs rely on leftover seeds to start the next generation.
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Use exterior treatments strategically: Well-timed applications around the foundation make a big difference. This is where Boise Pest Pros comes in!
Think of it like putting a velvet rope and a bouncer at the door. They can look, but they can’t come in.
Ripped screen inviting every bug in Boise for a free fall staycation
How Boise Pest Pros Tackles Boxelder Bugs
We take a targeted, locally informed approach that aligns with Idaho’s best management practices:
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Exterior Barrier Treatment — We apply high-quality pest control products along foundations, soffits, fascia, and common entry points.
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Entry Point Inspection — We find the exact places bugs are sneaking in.
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Perfect Timing — Fall treatments (August–October) stop them before they can crash inside.
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Safe & Family-Friendly — All treatments are pet- and kid-safe once dry.
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Ongoing Protection — Optional year-round plans keep future swarms at bay.
A Quick Word on DIY Sprays
Yes, there are over-the-counter insecticides available, but improper use can:
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Harm pollinators and beneficial insects
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Pose risks to kids and pets
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Waste your time and money
Protect Your Home
Don’t let these pests take over your home. Contact Boise Pest Pros today for a thorough inspection and effective treatment plan. Keep your home safe, comfortable, and pest-free this season!
📞 Call Boise Pest Pros at 208.900.4680
🪲 Serving Boise, Meridian, Nampa, Caldwell, Eagle, Star, Middleton, and beyond
By Logan Kimball, Owner of Boise Pest Pros – Serving Boise, Meridian, Nampa, Caldwell, Eagle, Star, & Middleton, Idaho
