As soon as temperatures rise in spring, many people suddenly notice small ant trails in the kitchen, living room, or on the terrace. What wasn’t an issue in winter can become a visible problem within a few days.
But why do ants appear so frequently in houses and apartments especially in spring? And what can be done about it?
In this article, we explain the most common causes – and show which measures really help.
Why ants become active in spring
Ants usually spend the winter in a kind of dormant phase. Their activity strongly depends on temperature. As soon as the soil and buildings warm up in spring, the colonies start searching for food again.
Several factors play a role here:
1. Food shortage after winter
After the cold months, many natural food sources outdoors are still limited. That’s why ants increasingly look for alternative sources – and often find them in houses.
Especially attractive are:
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Sugary foods
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Crumbs and food residues
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Fruit and sweet drinks
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Pet food
Even the smallest amounts can be enough to attract ants.
2. Warmth and shelter in buildings
Houses provide ideal conditions for ants:
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Constant temperatures
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Dry areas
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Protected niches for nests
Cracks in masonry, joints, window frames, or cable entries can serve as entry points.
3. Ants follow scent trails
As soon as an ant finds a food source, it leaves a scent trail (pheromone trail). Other ants follow this trail – and within a short time, a visible ant trail forms.
This explains why ants suddenly appear "out of nowhere."
Where ants typically enter the house
Ants only need very small openings to enter buildings.
Common entry points are:
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Cracks in walls or floors
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Door and window frames
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Leaky joints
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Cable entries
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Terrace or balcony connections
Plants, wood, or packaging can also bring ants into the house.
Typical places for ants in the house
Ants are especially common in areas where food or moisture is present.
These include:
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Kitchens and pantry cupboards
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Eating areas
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Trash bins and organic waste
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Pet feeding areas
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Patios and balconies
Especially in spring, windowsills and patio doors are typical entry points.
What you can do against ants in the house
An ant infestation can often be contained with some targeted measures.
1. Remove food sources
The most important step is to offer ants no food.
Helpful are:
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Store food airtight
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Remove crumbs and food residues immediately
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Clean surfaces regularly
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Keep trash bins closed
2. Remove scent trails
Since ants communicate strongly via scent trails, these should be removed.
Suitable examples are:
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Vinegar water
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All-purpose cleaners
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Alcohol-based cleaners
This causes the ants to lose their orientation.
3. Seal entry points
To make it harder for new ants to enter, possible openings should be sealed.
These include:
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Cracks in masonry
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Joints at windows and doors
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Gaps at baseboards
4. Check ant nests nearby
Sometimes the nest is located very close to the house – for example, in the garden, under patio slabs, or in the masonry.
In such cases, targeted control may be necessary.
When professional pest control makes sense
If ants keep appearing or large ant trails form, a hidden nest in the building or nearby may be the cause.
Professional pest controllers can:
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identify the exact species
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locate nests
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carry out targeted and sustainable measures
This is how an infestation can be controlled in the long term.
Conclusion
Ants in spring are a common phenomenon. As temperatures rise, the insects start actively searching for food again – often finding it in houses and apartments.
Good hygiene, removing scent trails, and sealing possible entry points can usually reduce an infestation. However, if ants persist, professional help may be advisable.
Our recommendations against ants:
