As soon as temperatures rise in spring, many people suddenly notice small trails of ants in the kitchen, living room, or on the patio. What was not an issue in winter can become a visible problem within just 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 is strongly dependent on temperature. As soon as the ground and buildings become warmer in spring, the colonies begin searching for food again.
Several factors play a role:
1. Food shortage after winter
After the cold months, many natural food sources outdoors are still limited. As a result, ants increasingly search for alternative sources—and often find them in houses.
They are particularly attractive:
- Sugary foods
- Crumbs and food leftovers
- Fruit and sugary drinks
- Pet food
Even very small amounts can be enough to attract ants.
2. Warmth and shelter in buildings
Houses provide ants with ideal conditions:
- Stable temperatures
- Dry areas
- Protected niches for nests
Cracks in masonry, joints, window frames, or cable openings 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 trail of ants 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 include:
- Cracks in walls or floors
- Door and window frames
- Leaky joints
- Utility line openings
- Patio or balcony connections
Plants, wood, or packaging can also bring ants into the house.
Typical places to find ants in the house
Ants are particularly common in areas where food or moisture is present.
These include:
- Kitchens and pantry cupboards
- Dining areas
- Garbage bins and organic waste
- Pet feeding areas
- Patios and balconies
Especially in spring, window sills and patio doors are typical entry points.
What you can do about ants in the house
An ant infestation can often be contained with a few targeted measures.
1. Remove food sources
The most important step is not offering ants any food.
Helpful tips:
- Store food in airtight containers
- Remove crumbs and food leftovers immediately
- Clean surfaces regularly
- Keep waste containers closed
2. Remove scent trails
Because ants communicate extensively through scent trails, these should be removed.
Suitable examples include:
- Vinegar solution
- All-purpose cleaners
- Alcohol-based cleaners
This causes the ants to lose their orientation.
3. Seal entry points
To make it more difficult for new ants to gain access, potential openings should be sealed.
These include:
- Cracks in the masonry
- Gaps around windows and doors
- Gaps along skirting boards
4. Check for nearby ant nests
Sometimes the nest is located directly near the house—for example, in the garden, beneath patio slabs, or in the masonry.
In such cases, targeted control may be necessary.
When professional pest control is advisable
If ants keep appearing or large ant trails form, a hidden nest may be located inside the building or in the immediate vicinity.
Professional pest controllers can:
- identify the exact species
- locate nests
- 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 become active again in search of food—and often find it in houses and apartments.
Good hygiene, removing scent trails, and sealing potential entry points can usually help reduce an infestation. However, if ants persistently appear, professional assistance may be advisable.
Expertise: Recognize ant season early and prevent infestations
Ant activity begins with the first warm days. Anyone who recognizes typical entry points, initial trails, and attractive food sources now can respond before pronounced ant trails form inside the building.
The online course “Expertise: Ants” shows you how to:
- reliably distinguish the most important ant species,
- correctly assess the first signs of an infestation,
- identify entry points and conditions that promote infestations,
- select suitable products in a targeted and safe manner,
- avoid unnecessary spraying and other common mistakes,
- reduce recurring infestations through prevention and follow-up inspections.
In ten compact online lessons featuring instructional videos, PDF materials, and knowledge checks, you will acquire practical expertise in around 90 minutes. After passing the final exam, you will receive a certificate of participation and achievement.
Ideal for property managers, building service providers, commercial businesses, and anyone who wants to prepare for ant season in good time.
Book the online course “Expertise: Ants” now and be prepared to act at the start of the season.
