Warmer nights bring out the redbacks and the huntsmen. Here's what's actually dangerous, what just looks scary, and how a single external treatment keeps numbers down all summer.
What's active in a Toowoomba spring
From mid-September the overnight minimums on the Downs creep above 10°C and spider egg sacs that have been sitting dormant all winter start to hatch. By November every shed, retaining wall and outdoor furniture set has a fresh population.
The two species that matter most are the redback (Latrodectus hasselti) and the grey/brown huntsman (Heteropoda and Holconia spp). Wolf spiders, garden orb-weavers and black house spiders are also common but rarely a medical concern.
Redbacks: the one to take seriously
Redbacks love dry, sheltered, undisturbed spots — the underside of outdoor furniture, inside trampoline springs, around the lip of a colorbond fence, in the corners of the letterbox, and inside rarely-moved pot plants.
A redback bite is a genuine medical emergency for small children, the elderly and pets. Antivenom is still stocked at Toowoomba Hospital but the standard advice is: apply a cold pack (NOT a pressure bandage — that's for snakes and funnel-webs) and get to an emergency department.
Huntsmen: scary, mostly harmless
Huntsmen are the giant flat spiders that turn up on the inside of the windscreen at the worst possible moment. They're not aggressive, their bite is medically insignificant for most adults, and they actually keep cockroach and moth numbers down.
If you find one inside, the textbook removal is a takeaway container and a sheet of cardboard — slide it over, take it to the back fence, done. Spraying it is the worst option: a panicked huntsman runs faster than you can aim.
What a real spider treatment looks like
Web-and-dust of the entire building perimeter, eaves, weep holes and window frames — this physically removes existing webs and egg sacs.
Residual application of a synthetic pyrethroid (typically bifenthrin or deltamethrin) to the same surfaces. This creates a 6–8 month barrier on treated surfaces.
Targeted treatment of high-risk harborages: under decks, around the pool pump, inside the meter box, around outdoor power points and the trampoline frame.
Keeping the population down between treatments
Sweep down visible webs weekly during spring. New webs mean new feeding spots — clearing them disrupts the cycle.
Swap white outdoor lights for warm yellow LEDs. White light pulls in moths and midges; the spiders follow the food.
Move firewood and stacked timber away from the house. These are five-star redback hides.
Shake out shoes, gloves and outdoor cushions before use during October–March.
FAQs
Is a single annual spider treatment enough?
For most Toowoomba homes, yes — a properly applied external treatment in early spring covers the active season. Heavily treed properties or homes with sheds and pool areas often benefit from a top-up in January.
Are the chemicals safe for kids and pets?
Once the treated surfaces are dry (usually within 1–2 hours), the residual products used by licensed technicians are safe for re-entry. We avoid spraying lawns where pets graze and we tell you exactly what was used.