Spiders

Aranea · Health risk

Found in the places you reach into without looking.

How to identify

Eight legs and two main body sections
Vary in size, shape, and color
Some build webs, while others hunt on foot

Signs of activity

Webs in corners, windows, and garages
Egg sacs in sheltered areas
Live spiders in basements, closets, or storage areas

When they’re active

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Home Pest Control

Types of Spiders in Colorado

There over 30,000 classified species of spiders. The most common spiders in Boulder, Denver, Fort Collins, Loveland, and throughout Colorado are:

House spiders
Rock spiders
Wolf spiders
Black widow spiders

Although single specimens of brown recluse spiders are sometimes brought into the state, natural populations are not found in Colorado.

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Types Of Spiders, Treatments & Prevention Tips For CO Residents

Frequently Asked Questions

Colorado Spiders FAQs

Are Spiders Dangerous?

The venom of a black widow spider is a neurotoxin and is used as a defense. Black widow spiders do not bite humans instinctively. The black widow spider bite can cause severe pain. Young children and the elderly are especially susceptible to a severe reaction to a black widow spider bite. Most other spiders in our area do not pose a significant risk, however, a spider bite can be unpleasant and irritate the skin.

Why Do I have Spiders in my Home?

No real reason. Most homes in our area experience spiders in and around there house primarily during the summer months when insect levels are high. Same goes for commercial and industrial facilities.

How Do I Get Rid of Spiders?

Getting rid of spiders can be a tricky task as they are elusive creatures. That’s why our service includes everything necessary for one fee. Our treatment method consists of the following:

Detailed inspection of the entire structure identifying areas of activity and entry points.
A treatment around the foundation, garage, eaves, soffits, etc is applied on the exterior. Any accessible webs will be removed.
On the inside, our technician will apply an all natural dust and limited amounts of a liquid material in areas where the spiders are or may travel.
We may also install Pest Monitor Stations which have a glue board in them to capture and monitor the area.

Is the Treatment for Spiders Safe?

EnviroPest uses the least amount of material as possible while still resolving the problem. We utilize natural products, baits and mechanical means as a form of treatment as much as possible. When conventional materials are required, we follow very stringent guidelines for the use of the product so that it poses no threat to people or pets. All products are registered by the EPA. Our service technicians will inform you of any specific safety measures that need to be taken.

How Soon Can You Get Here?

We take all pest problems seriously and are committed to helping you ASAP. In most cases, we can respond the same or very next day.

How Much Does Spider Control Cost?

Treatment cost varies, however you can visit our Colorado’s Choice program page for more information or request a quote for spider control!

Can I Prevent Spider Problems?

Pest problems can be difficult to prevent. Many of our clients choose to continue with routine pest control service to keep spiders and other household pests out of their home. Our Colorado’s Choice plan is a great option to keep spiders and other common pests out of your home.

What’s moving right now

+55%
voles · up over the past 3 weeks

FRONT RANGE · Fall 2026

Vole populations peak in fall, just before snow gives them cover. Treat now and protect your trees, before they chew bark all winter unseen.

Weather driver: Fall breeding peak before snowfall

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See the treatment plan →

Deer Mouse+85%
Pocket Gopher+25%
Cottontail Rabbit-10%

+110%
Rats · up over the past 3 weeks

FRONT RANGE · Fall 2026

Rats are moving indoors as temperatures drop, and a gap the size of a quarter is enough. Seal and treat now, before they nest in your walls and crawl spaces.

Weather driver: Cooling nights pushing rats indoors

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See the treatment plan →

House Mouse+140%
Packrat+60%
Pocket Gopher+25%

+50%
Raccoons · up over the past 3 weeks

FRONT RANGE · Fall 2026

Raccoons are fattening up and searching for warm places to spend the winter. Seal your roof and attic now, before one moves in.

Weather driver: Cooling nights and the search for winter dens

Get this treated
See the treatment plan →

Fox Squirrel+65%
Striped Skunk+30%
Red Fox-10%

+40%
Pigeons · up over the past 3 weeks

FRONT RANGE · Fall 2026

Pigeon flocks are claiming warm rooftops and ledges for the winter. Bird-proof now, before they settle in and droppings build up.

Weather driver: Cooling nights pushing flocks toward warm roosts

Get this treated
See the treatment plan →

European Starling+90%
Northern Flicker+35%
House Sparrow-10%

+35%
Mosquitoes · up over the past 3 weeks

FRONT RANGE · Fall 2026

Mosquitoes are looking for shelter in garages and basements, and West Nile risk lasts until the first hard freeze. Treat now to finish the season protected.

Weather driver: Cooling nights driving mosquitoes into shelter

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See the treatment plan →

Culiseta inornata+30%
Culex tarsalis-45%
Inland Floodwater Mosquito-70%

+30%
Honey Bees · up over the past 3 weeks

FRONT RANGE · Fall 2026

Bees in your walls are settling in for winter. Fall is the last window for a safe live removal before cold weather sets in.

Weather driver: Cooling days and fading bloom

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See the treatment plan →

Western Yellowjacket+40%
European Paper Wasp-35%
Bumble Bee-60%

+45%
Earwigs · up over the past 3 weeks

FRONT RANGE · Fall 2026

Earwigs are slipping indoors as nights cool. Seal gaps and treat the foundation before they hide in basements and under doors.

Weather driver: Cool nights and fall rains

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See the treatment plan →

Millipede+60%
House Centipede+20%
Pillbug-25%

+55%
Cockroach · up over the past 3 weeks

FRONT RANGE · Fall 2026

Cooling nights are driving cockroaches into basements and crawl spaces. Seal and treat now, before they settle in for winter.

Weather driver: Cooling nights driving roaches indoors

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See the treatment plan →

German Cockroach+25%
Brown-banded Cockroach+15%
American Cockroach-30%

+150%
boxelder-bugs · up over the past 3 weeks

FRONT RANGE · Fall 2026

Boxelder bugs are swarming sunny walls and slipping inside. Seal and treat now, before they settle into your walls for winter.

Weather driver: Cool nights and warm afternoons

Get this treated
See the treatment plan →

Asian Lady Beetle+80%
Western Conifer Seed Bug+65%
Elm Seed Bug-40%

+85%
Bed Bug · up over the past 3 weeks

FRONT RANGE · Fall 2026

Back-to-school moves and late-summer trips are spreading bed bugs. Get an inspection before they settle in for the winter.

Weather driver: College move-ins and late-summer travel

Get this treated
See the treatment plan →

Bat Bug+50%
Swallow Bug+40%
Flea-30%

+60%
Bats · up over the past 3 weeks

FRONT RANGE · Fall 2026

Bats are looking for warm places to spend the winter. Seal your home now, during the best window of the year for safe exclusion.

Weather driver: Cooling nights and fewer insects

Get this treated
See the treatment plan →

Little Brown Bat-20%
Hoary Bat-60%
Mexican Free-tailed Bat-75%

+85%
Odorous House Ant · up over the past 3 weeks

FRONT RANGE · Fall 2026

Ants are heading indoors as nights dip below freezing. Treat now before colonies settle into walls and slabs for the winter.

Weather driver: Cold nights, warm foundations

Get this treated
See the treatment plan →

Pavement Ant+41%
Carpenter Ant-18%
Field Ant-27%

+90%
Spiders · up over the past 3 weeks

Northern Colorado · Fall 2026

Male spiders are wandering indoors looking for mates, which is why you’re seeing more of them now. Treat the perimeter before they settle in for winter.

Weather driver: Cooling nights and mating season

Get this treated
See the treatment plan →

Orb Weaver+70%
Wolf Spider+30%
Western Black Widow-30%

+40%
Western Yellowjacket · up over the past 3 weeks

FRONT RANGE · Fall 2026

Yellowjackets get aggressive as their food runs low, swarming trash, patios, and picnics. Treat nests now to finish the season sting-free.

Weather driver: Shrinking food supply making colonies aggressive

Get this treated
See the treatment plan →

Bald-faced Hornet+20%
European Paper Wasp-35%
Mud Dauber-55%

+140%
House Mouse · up over the past 3 weeks

FRONT RANGE · Fall 2026

Mice are moving indoors as temperatures drop, and a gap the size of a dime is enough. Seal and treat now, before they nest in your walls for winter.

Weather driver: First freezes pushing mice indoors

Get this treated
See the treatment plan →

Deer Mouse+85%
Norway Rat+30%
Meadow Vole-15%

+120%
Subterranean Termite · up over the past 3 weeks

FRONT RANGE · Fall 2026

Mud-tube and damage reports are climbing. Schedule an inspection before winter slows activity and hides the damage.

Weather driver: Warm, wet soil after late storms

Get this treated
See the treatment plan →

Powderpost Beetle+10%
Carpenter Ant-18%
Carpenter Bee-50%

Eric G.

Great experience with the pest control service. Alexander did a thorough job spraying both the inside and outside of the home and took the time to explain what they were doing. I especially appreciated that he didn’t just treat the home but also pointed out areas around the house that could allow pests to get inside and recommended repairs and preventative measures to help keep them out. The service was professional, thorough, and informative, and I appreciated the attention to detail. I would definitely recommend them to anyone looking for reliable pest control and helpful advice from Alexander on preventing future pest problems.

a month ago

Aaron S.

Our garage had been infested with mice. They left quite a mess. EnviroPest has systematically worked to eradicated the mice, mitigate entry points, and most recently completed a thorough cleanup and sanitation process. Along the way, they have all been professional, friendly, and have gone out of their way to explain their findings and recommendations. I never felt like we were being upsold. Overall very satisfied and would call them again if needed.

3 months ago

A V.

Mark has come to service my property a few times and does a great job answering questions and focus on my areas of concern. I like having the rapport with someone familiar with my previous service and property needs.

6 months ago