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How Fast Does Baking Soda Kill Mice?

Did you know that more than 29% of America’s population has a rodent problem in their home? The leading contender ― mice! These scurrying critters can spread diseases-causing parasites and salmonella. They cause quite the mess because they urinate constantly and can drop around 25,000 fecal pellets every year. Gross.

Unlike critters, it’s hard to kill rodents… especially mice and we will tell you why in a while. So, to answer your question how fast does baking soda kill mice ― in a day or two or… weeks.

Mice invading your house poses a bubonic problem. They will take over your house and after watching countless episodes of Tom & Jerry, by now you should know that getting a cat is the solution to your mice problem. To be honest, if we didn’t know better, we would have assumed long ago that mice are as sneaky and intelligent as Jerry.

That totalitarian win you have been dreaming about won’t come with a repellent. You will first have to find the mouse nest, which by the way contains 2 dozen mice and then commit mass murder. It can get nasty real fast, so we would suggest that you not do this.

Since it will be difficult for you to find the mouse nest anyway, why not lure them in your trap? To get victory over this vermin, you will have to hatch a devious plan and throw them a party.

Let’s talk about the basics of killing mice:

Is Baking Soda Toxic to Mice?

Baking soda, known as sodium bicarbonate, is used in all households for various reasons. From as a cleaning agent to cooking and setting traps for rodents and insects, this white powder is used in everything. It has all got to do with the chemical reaction it creates.

Looking at its chemistry won’t give you any answers but if you peek under your sink, you will for sure see that Arm and Hammer sign and the box sitting as pretty as you please. Our point being ― it’s in the kitchen, the bathroom, the laundry room and sometimes, even in the bedroom.

As for baking soda being toxic to mice, the answer is yes and no. And you thought we were going to give you a straight answer, didn’t you?

Don’t be confused. Here’s the reasoning behind it:

Why Is Baking Soda Toxic to Mice?

As the name suggests, baking soda is primarily used for baking. It helps soften and expand batter and dough. This reaction is achieved through the acid called “Leavening.” In layman terms, it’s foaming that is caused when gas (carbon dioxide) is released.

Now that you have an idea about how baking soda works, let’s take this knowledge and apply it to mice:

The code that needs breaking is that when this naturally occurring chemical can be used by humans to make delicious baked treats of the non-poisonous variety, then how come it’s toxic to mice? Don’t these rodents share around 85% to 99% of their genes with us!

One thing you might not know is that mice are highly resistant to natural poisons. As they get older, they quickly develop this trait by exploring their surroundings. Compared to humans, they have a stronger genetic code. This doesn’t mean that they suddenly grow immunity to certain poisons but just that they have immense control over their body.

Coming back to the code that needs to be cracked, the secret lies in the physiology and anatomy of mice.

Mice Cannot Digest Baking Soda

Apologies in advance for the vulgar knowledge we are about to impart now. If you have kids and pets in house, it’s better to avoid chemical mice killing recipes. This is why baking soda is your best option.

Coming to the anatomy of mice ― unlike humans, they haven’t yet discovered how to pass gas. It’s possible that flatulent comedic relief wasn’t that much of a necessary evolution amongst their species or is simply irrelevant. Whatever the case, this is the reason of their downfall.

When mice consume baking soda, they die in agony. When they are not able to digest, it presses on their organs and that’s how it kills them. You might still see little footprints in your trap but that’s because they are struggling to survive. Before taking their last breath, they will find a dark corner and collapse there. If this happens, you will smell their rotting corpse after a while. This will start a whole new series of infestation.

So, better block off any corners or slits through which mice might get into the walls or underneath floorboards. Your last resort is to call a pest cleaning crew because they are experts at this sort of a thing.

DIY Mice Poison Remedy

Now that we have established that baking soda is a potential poison for killing mice, let’s take a look at how to use it:

How fast will baking soda kill mice depends on the trap you are setting. A clear sign that will tell you have mice running around in your house is fecal pellets. The top three poisons for killing mice are Plaster of Paris, boric acid and baking soda. The former two are seldom found in houses and this is why the latter is a clear winner.

Before you dump baking soda over the floor where you saw the fecal pellets, we would like to tell you that this won’t work. Somehow, a mouse knows not to ingest a gooey ball of baking soda, which is why you need to be sneaky.

Just like you trick your child into eating veggies by coating them in cheese, you need to disguise the foaminess of baking soda with food.

Following are two baking soda DIY remedies for killing mice:

DIY Remedies for Killing Mice

Recipe #1 Recipe #2
  • Baking Soda: ½ cup
  • Peanut Butter: ¼ cup
  • Baking Soda: ½ cup
  • Sugar: ¼ cup
Mix together the two ingredients into small tiny balls that the mice will easily eat. Mice prefer sugar over other food items. To use this remedy, first thoroughly mix the two ingredients in a grinder. You can then use the fine powder as a coating agent.


  • Wear disposable gloves so that you don’t get the wet mess on your hands and also because mice might detect your scent on the food and not eat it
  • If you have a mice infestation, then we suggest adding a little chocolate into the mix
  • For the peanut butter balls, place them in a Tupperware and for the loose sugar and baking soda powder; sprinkle it in all the places you saw the fecal pellets
  • Target the areas that mice visit the most such as near the garbage bin, in dark corners and outside drains
  • Monitor the areas regularly to see if there are any little footprints on the powder or if the peanut butter balls are missing
  • If mice consume enough of any of these ingredients, they will die in a day or two. However, you will only able to tell this when you no longer see any fecal pellets

Note: The ratio of baking soda to food ingredient should be 3:1. This ensures that you are feeding the mice poison and not filling their bellies with food. The average lifespan of mice is 5 years and one in captivity is 2 years. This is because they have access to food. However, if you capture and cage them without food and water, they will die within 4 days.

Making a Bait Station

Whether you have a lone mouse roaming inside the house or a nest, the best way to capture and kill them and make sure they die in a place where they are visible is to create a bait station. This bait station should be warm, cozy and dark.

Here, you have two options: you can use a cut off piece of PVC pipe and place it in a dark corner or you can use small wood chips to create a nest. If this bait station remains undisturbed by you, the mice will consider it their home and will for sure take their last breath here.

Final Word

This is a lot of information to digest and we get it. To summarize how fast does baking soda kill mice, a day or week at most. It all depends on how effective your poison is. Was the baking soda of good quality? Did the mice fully eat the poisonous treat? Did they develop immunity to it?

There are various things at play here but one thing you can be sure of is that if the trap is set at the right place and is yummy enough, then the mice won’t survive. A word of advice ― don’t go with the stereotype that mice love cheese. In fact, this treat is quite low on their favorite food list. They love chocolate and peanut butter more than any other sweets.