When Do Spider Eggs Hatch?

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Spider eggs

You may have seen spiders scurrying around inside or outside your property, but chances are, you haven’t thought much about where these spiders come from — namely, their eggs. Since eggs are where spiders originate, you should become informed about them, in the case that you have spider egg sacs in your home or business.

Take time to learn more here about spider egg sacs, the eggs of some different kinds of spiders, and how to get rid of spider eggs. If you’re concerned about spiders inside your property, reach out to Western Exterminator at 800-937-8398 or contact us online to have an expert take a look at the problem.

Do spiders lay eggs?

Yes, spiders lay eggs. After female spiders mate with males, they keep sperm in a holding place so they can fertilize the eggs. They fertilize the eggs right before laying them.

How many eggs do spiders lay?

Most female spiders yield many eggs in order to make sure the species survives. Up to several hundred eggs are put in a sac. Females can create more than one sac but that differs based on the species.

Female spiders’ abdomens may expand due to a high amount of eggs, and their bodies contract after they lay the eggs. Spider eggs are laid during different times. For example, hobo spider females lay eggs in mid-September to October, but brown recluse spiders typically lay eggs between May and July.

Spider egg sac

Typically, spider eggs are contained in a silken sac, which guards the eggs from predators as well as changing temperatures. An egg sac can be larger than the actual spider. Spider egg sacs don’t all look alike — they may be flat or round or look like something else, and they can have varied colors such as brown or white.

The cocoon can be located in the soil, hang in a web, be held to a leaf, or can be found elsewhere. Long-bodied female cellar spiders usually transport their egg sacs between their jaws until the eggs hatch. Other spiders — like the wolf spider, for instance — also tote their egg sacs. Nursery-web spiders carry their egg sacs as well and create a spot for their egg sac to rest when the eggs are close to hatching. Spiders that yield multiple cocoons have an inclination to desert them.

Read about the egg sacs of a couple of spiders below. If you are seeing spider egg sacs around your home and have concerns, contact Western Exterminator immediately.

Black widow spider eggs

You may have heard about the symptoms of a black widow spider bite. But how much do you know about black widow spider eggs? Female black widows put eggs in silk egg sacs that have a diameter of about ⅜ inches to ½ inches. Western black widow spider egg sacs are yellowish in color and are shaped like teardrops. Their sacs typically have about 300 eggs.

Brown widow spider eggs

Brown widow spiders are grayish-brown or brown in color. Their egg sacs are yellow in color, round and have silk spikes, in contrast to western black widow spider egg sacs, which are smooth. The spikes give the brown widow spider egg sacs a distinguishable look. The brown widow spiders lays about 120 to 150 eggs for each sac. It has the ability to create 20 egg sacs during its life.

Spider eggs hatching

The young spiders may not hatch for weeks. Some spiderlings remain in eggs during the winter and hatch in the spring; others hatch in a shorter period of time.

Spiderlings leave the sac after molting. At this time, they are pale in color. Actually, it is possible at times to view evidence of the first molts in the egg sac under a magnifying glass. In a phenomenon known as ballooning, the early-stage spiders in many species climb to a high spot and float onto the wind on silk threads in order to disperse.

See also:  What To Do When You Have A Spider Bite?

Most spiders take about a year to become adults. They undergo roughly 4 to 12 molts before becoming mature. Compared to females, males typically go through fewer molts — they have smaller bodies.

How to get rid of spider eggs

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Spider Eggs in the House: What do You Need to Know?

Most household spiders are harmless to humans and prefer to feast on bugs rather than people. And once these spiders move into your home, they soon begin laying eggs. Here are some things you should know to help avoid a spider infestation — and some telltale signs to be on the lookout for.

Spider eggs

Spiders living in your home can lay many eggs very quickly. A female spider wraps her young in a silken egg sac, which she may hide in a web or carry with her as she forages through your house. Female brown and black widow spiders can produce 10 to 20 egg sacs in their lifetime, each containing 150 to 300 eggs. However, the survival rate for these eggs is low.

Spider eggs typically hatch in 2 to 3 weeks, which can vary based on species and season. Once spiderlings fully emerge, they usually settle close to the nest area for several weeks before moving on and staking out their own territory.

Helping get rid of spider eggs in the house

Taking measures to help keep your home free of egg sacs and the spiderlings they contain is an effective way to help avoid an infestation. Luckily, there are several simple methods for helping remove or eliminate spider eggs you may find within your home.

Spider eggs are fragile and can be removed with a broom or vacuum cleaner. If using a vacuum, remove the bag after each cleaning and dispose of the debris, including the eggs, in a sealed plastic bag. When sweeping up spider eggs, try to make sure that no spiderlings have escaped the dustpan before you seal the eggs in a plastic bag.

You can also use glue traps available at your local market or hardware store to help get rid of any spiders you discover in your house. Follow the manufacturer’s instructions carefully and only use these products safely out of the reach of children and pets.

Helping keep new spiders from moving in

To help discourage new spiders from building nests inside your home, reduce clutter in and around your property as much as possible.

  • Place backyard woodpiles, mulch, rocks and compost well away from the home.
  • Store items, such as gardening gloves, clothes and sports equipment, in sealed plastic bags that will help keep spiders out.
  • Carefully inspect your attic and crawl space and clear out spider webs and eggs wherever you find them.

If you have taken steps to remove spider eggs in your house but the problem persists, or you want the help of a trained professional from the start, contact the pest control professionals at Terminix®.

The Best Mouse Trap Method

Everyone has seen the cartoon mouse trap: A big wedge of cheese perched precariously on a small wooden rectangle, just waiting for an unsuspecting mouse to come along. Most modern mouse traps don’t use pieces of cheese, although they can still use food as bait. One of the most popular baits, believe it or not, is peanut butter. There are still versions of the snap trap from cartoons, but there are also other kinds like electronic traps. Because these traps usually mean dealing with dead mice, plenty of people wonder if there’s a way to help get rid of mice without classic mouse traps. Although mouse traps are the most effective in helping to get of mice, you can also try the following natural methods to see if they help remove these pesky rodents.

How to Help Remove Fruit Flies from Your Home

Fruit flies are one of the most common household pests and they can be a huge nuisance for homeowners. Not only that, but researchers have found that fruit flies can “transfer bacteria from a contaminated source, food, or waste to surfaces or ready-to-eat food.

Control Yard Invasions: Gophers, Moles, and Voles

Any homeowner with a yard runs the risk of having their lawn terrorized by burrowing animals. Gophers and moles are animals that can cause extensive damage to a yard by digging complex networks of tunnels below ground. While these pests are most likely to be active in the spring and summer when the soil is most malleable, they remain active in the winter by burrowing even further into the ground to escape the colder temperatures. Voles can also cause lawn damage with their runways. Though it may be hard to tell these pests apart, knowing what each animal looks like and how they cause damage can help you practice the best gopher, mole and vole control methods and protect your home’s yard.

How to Naturally Get Rid of Bugs on Plants

Buying houseplants can put you at risk for harboring unwanted pest infestations. Before these bugs cause damage to your new plant, know how to take care of them using natural remedies.

See also:  What Does A Spider Web Look Like?

How to Help Prevent Mosquito Bites

Itchy bites and illness may occur after exposure to some arthropods such as mosquitoes and ticks. The bites can cause discomfort and, in some cases, transmit pathogens (bacteria, viruses and protozoans) that can cause a variety of diseases. Some examples of diseases that are of concern in the United States include: (mosquito) chikungunya, dengue, La Crosse encephalitis, West Nile fever, Zika; (tick) Lyme disease and Rocky Mountain spotted fever. The good news? There are many precautions you can take to help avoid bites from mosquitoes and ticks.

How to Get Rid of Ticks in the Yard


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What Time Of Year Do Spiders Lay Eggs?

I have always wondered about this even before I became a pest exterminator.

What time of year do spiders lay their eggs? The brief answer is spider multiply all year. Even though they will appear less active in the winter and fall they will still mate, lay eggs and feed.

Where Do Spiders Lay Eggs?

Spiders won’t usually lay their egg sac in a easy to reach place. They normally find a place that is protected from the elements and predators.

Many species of spider will protect the sac with many layers of silk, followed by a web. Spiders will also stay around and guard the egg sac as to protect their little spiderlings from harm.

Some spiders carry their spiderlings on their back until they are big enough to go out on their own.

How Many Eggs Do Spiders Lay?

The female spider will typically lay between 15-20 egg sacs during their lifetime. There is usually about 150-200 eggs in each egg sac. This is a general answer for most species of spider. as some spiders don’t use an egg sac.

Where Do Spiders Go When They Hatch?

The young nymph spiders will when they are ready leave the egg sack and venture out into the great unknown.The exception to this is in the colder months the immature spiders will stay in the sac and wait it out until spring. Spiderlings will cast their parachute silk string and drift away they don’t travel very far from there point of origin. They will the immature spiders will stay in the sac longer during the colder months.The young spiderlings will be seeking out the light, but when they get older they will prefer the darkness.

Lots of the spiderlings will be devoured by predators, such as the praying mantis, and blue lizards etc. Although only a small percentage of them will survive to adulthood, the population will increase if left unchecked.

Where Do I Find Spiders In And Around My Home?

While very hardy and versatile creatures, spiders do have certain places that they like to seek out in order to lay their egg sacs. They like to find somewhere without too much moisture, noise or light. Wood piles, under rocks, and compost provide a perfect location for them to lay their eggs.

If you ever look at your bushes and trees just outside your home, it is easy to find spiders webbing all throughout those areas. Alway make sure to cut back foliage and vegetation from directly touching your home as to avoid unwanted infestations.

Other places that spiders prefer are:

  • Crawl spaces/Basements
  • Window fixtures
  • Sheds, and other dry outdoor places
  • Attics
  • Inside cracks in the walls
  • Under your Furniture

There are ways to deter spiders from laying eggs on your property. You can use a cobweb duster to brush the inside and outside of your home, or any other affected areas. Downspouts, window sills, eaves and soffits, doorways, as well as some of the other places previously mentioned, are the areas you want to target.

You will generally find spiders where they can have a good meal too, this means if you keep other pests away you can keep the spiders away too.

What are Some Tips For Dealing with Spiders?

If you decide to work out in the garden make sure to wear gloves as to avoid an unwanted bite. Even though not all spiders are poisonous you will still feel discomfort or itchiness from a spider bite.

Fall is the prime time for pest infestations. As food supplies diminish due to cooler weather, and many of the bugs set about their searches for safe places to wait out the winter. Arachnids (spiders) during this time of year begin to make more public appearances. Even though arthropods (spiders) are more shy by nature, and have a tendency to stay out of sight, they will work their way inside. Many of the nation’s arachnid species are harmless, although certain exceptions could be moving into your home as we speak.

See also:  What Does A Spider Sack Look Like?

What Spiders Are Dangerous In North America?

There are 2 spiders indigenous to North America That are considered most dangerous to humans:

Brown Recluse – This spider will usually bite unintentionally, It will usually happen when a hand or foot goes across a place that the spider is hiding and as a knee-jerk reaction it bites. When they bite there is normally no pain at first but as the venom makes it’s way into your bloodstream pain and skin deforming will start to happen. So it takes just hours to recognize that it happened, and weeks for it to fully heal if medical attention is sought out.

Black Widow – Even though death is rare when dealing with the Black Widow, and with none reported in more than 10 years , these statistics offer no comfort when thinking of the potential danger.

If you are ever bitten by a black widow please seek medical attention immediately.

Symptoms Can Be:

  • Redness, pain and swelling at the place of injection
  • Headache
  • Sweating
  • Dizziness
  • Nausea
  • Chest and/or abdominal pain
  • Difficulty breathing
  • Trembling
  • Limb paralysis

Fun Fact – Some black widow spiders have a red hourglass, some have two red or orange spots on their abdomen and some have no marks at all but their body shape is still the same!

Important –

If you find yourself or a loved one was bit by one of these spiders it is important to keep an eye out especially as a child or elderly person can be more susceptible to worse reactions or death.

Pest Insider Secret: You can use commercial chemical like the pros to treat your own home.

What Treatment Options Work Best For Spiders?

As much as spiders can be a good thing to have around too much of a good thing can not be good at all, that being said;

Here Are Some Treatment Options:

Non-Chemical – Keep cobwebs down in and outside your home. The tool you will want to use for this is a web buster. i.e. cobweb duster. Keep in mind if there is nothing in or around your home for spiders to eat they will move on. Always make sure to keep your home clean as to not invite other bugs in your home, it will help keep the spider population down.

Chemical Treatment – Talstar P is a wonderful chemical to use outside your home that is easy on the wallet. With the active ingredient bifenthrin it packs a punch but is safe enough to use for folks with children or pets. Once this chemical drys it lasts about a month.

On the inside of your home there is a great chemical that micro-encapsulates (is the process in which the chemical after it dries gains a long lasting protective coating). The chemical is called Demand CS. Demand CS has an active ingredient called lambda cyhalothrin it lasts up to 60 days inside your home if it is not broken down by mopping or carpet cleaning.


Spiders do lay their eggs all year and you can expect that if they make their way into your home in the fall that there will be hundreds trying to make there way around in the spring. This is manageable with proper treatment and cleanliness you can rest easy without worry if you are proactive about it.

Related Topics:

How Much Can I Save Doing Pest Control Myself?

The average annual pest service can cost between $300-$700 dollars. The cost of having a Pest Control Company service your property will range from $75.00 – $150.00 dollars per visit, or more if there are large complications. The initial cost you will spend is between $65.00- $100.00 if you decide to treat yourself!

Remember when I said the chemical goes a long way? To treat your home you will use anywhere from 1/2 an ounce to 1 ounce of chemical per gallon of water. The average cost per treatment when you do it yourself is between $5-$15 per application. So the money spent for chemical will last a long time.

How Long Does Pest Control Last?

This will vary. When you apply a pesticide outside the elements can break the chemical down faster than it’s intended use. Chemicals can break down sooner if you have extended rainfall, flood, or snow. The sun also plays a factor in this equation. Most chemicals break down in 4-6 weeks. This is if you have normal conditions some rainfall is okay, but if it rains for a week straight you can expect that what you put down is likely not there anymore.

When you apply pesticide indoors the residual is longer because it is protected. Inside your home the chemical will usually last the full 4-6 weeks. Chemical can break down when mopping your floors or using other cleaners in the treated areas, but that would take many cleaning applications.

KEEP IN MIND… You should never apply a pesticide outside while it is raining! This could run off to waterways and contaminate natural habitats, creeks, ponds and drinking water

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About Us

Hi, I’m Mike, I have spent many years in the pest industry and wanted to share my experience and education with the world so if they desired so they could accomplish DIY Pest Control and do it with a confidence that it will work and that it is done correctly.


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