As Canberra’s temperatures drop from late April onwards, spiders start moving indoors. The city’s cold winters — with overnight temperatures regularly below zero — make your warm, dry home an irresistible refuge for spiders of all sizes. But with the right preparation, you can significantly reduce the number of unwelcome guests this winter.
Why Canberra Winters Drive Spiders Indoors
Canberra has one of the coldest climates of any Australian capital. Winter nights regularly drop to -5°C or lower, and frost is common from May through September. These conditions push spiders to seek shelter in heated buildings, garages, and subfloor spaces.
The autumn mating season (March-May) compounds the problem. Male spiders become restless and wander widely looking for females, which increases the chance of them ending up inside your home. This is when most people notice a sudden spike in indoor spider sightings.
Understanding this seasonal pattern means you can prepare before the influx begins, rather than reacting once they’re already inside.
-7°C
Canberra record low
80%
of spiders enter via gaps
6 Steps
to spider-proof your home
Apr–May
Best time to prepare
6-Step Spider-Proofing Guide for Canberra Homes
Inspect and Seal Entry Points
Easy
Walk around your home and identify every gap, crack, or opening where spiders could enter. Common entry points include gaps under doors, cracks around window frames, weep holes in brickwork, utility pipe penetrations, and gaps around air conditioning units. Use silicone caulk for small cracks, door sweeps for doorways, and stainless steel mesh for weep holes and vents.
Install or Repair Fly Screens
Easy
Every window and door that opens should have an intact fly screen. Check existing screens for tears, holes, or loose frames. Replace damaged mesh and ensure screens sit flush against frames with no gaps. Sliding door screens are particularly important as they provide a large potential entry point.
Reduce Outdoor Lighting
Easy
Bright outdoor lights attract flying insects, which in turn attract spiders looking for easy meals. Switch white LED security lights to yellow or amber alternatives. Consider motion-sensor lighting instead of leaving lights on all night. Move lights away from doorways where possible.
Clear Vegetation from Walls
Moderate
Trim all shrubs, creepers, and tree branches so they are at least 30cm from exterior walls and rooflines. Overhanging vegetation acts as a bridge for spiders to access your home. Remove ivy, jasmine, or other climbing plants from walls. Keep garden beds well-maintained with minimal ground cover against the house.
Declutter Interior Spaces
Moderate
Spiders thrive in cluttered, undisturbed areas. Clear out boxes from under beds and in wardrobes. Organise garage and shed storage using sealed plastic containers instead of cardboard boxes. Regularly vacuum behind furniture, in corners, and along skirting boards to remove webs and egg sacs.
Professional Pre-Winter Treatment
Professional
A professional spider treatment before winter creates a chemical barrier that kills spiders on contact for months. Technicians treat interior perimeters, exterior walls, entry points, roof voids, and subfloor areas — places you can’t effectively treat with retail products.
Room-by-Room Spider Prevention Checklist
A systematic approach ensures you don’t miss any vulnerable areas:
Bedrooms
- Shake out shoes before wearing
- Don’t leave clothes on the floor
- Move bed away from walls slightly
- Vacuum under beds weekly
Bathroom & Laundry
- Fix leaking taps (moisture attracts spiders)
- Seal gaps around pipes
- Keep floor dry overnight
- Check behind washing machine regularly
Kitchen
- Clean crumbs to reduce insect prey
- Seal gaps around sink plumbing
- Check behind appliances monthly
- Store pet food in sealed containers
Garage & Storage
- Replace cardboard with plastic bins
- Elevate stored items off floor
- Install weather seals on garage door
- Keep clutter minimal and organised
When DIY Isn’t Enough
Physical spider-proofing is essential, but it has limitations. You can’t seal every microscopic gap, and spiders that are already inside your walls, roof void, or subfloor will continue to emerge regardless of how well you’ve sealed the perimeter.
A professional treatment before winter addresses what DIY cannot. Professional-grade products applied to internal harbourage areas, wall cavities, roof voids, and the external perimeter create a lethal barrier that kills spiders on contact for up to 12 months. This combined approach — physical barriers plus chemical treatment — is the gold standard for spider-free living in Canberra.
Ready to Spider-Proof Your Home?
Bugs Patrol offers pre-winter spider treatments across every Canberra suburb. Our licensed technicians seal entry points and apply lasting protection so you can enjoy a spider-free winter.
Still have questions?
The best pest control company will solve your issue for a long time. Bugs Patrol is Canberra’s trusted choice for professional spider control with lasting results.
Frequently Asked Questions
Spiders enter Canberra homes in autumn and winter seeking warmth, shelter from cold temperatures, and to follow prey insects that have also moved indoors. Male spiders also wander indoors during late autumn mating season. Homes with gaps around doors, windows, and utility pipes are particularly vulnerable.
Focus on sealing gaps under doors with door sweeps, filling cracks around windows with silicone caulk, installing mesh over weep holes and vents, ensuring fly screens are intact, and sealing gaps where pipes and cables enter the house. Pay special attention to garage doors and laundry entry points.
Yes. Winter treatments are highly effective because spiders are concentrated in a smaller area — your home. Treating interior harbourage areas, entry points, and the building perimeter during winter provides excellent protection. An autumn or early winter treatment creates a barrier before peak indoor spider activity.
The ideal time is late autumn (April-May) before temperatures drop below 10°C consistently. This is when spiders begin seeking indoor shelter. A combined approach of physical sealing and professional treatment at this time provides the best year-round protection.
