Almost every Las Vegas homeowner eventually finds a scorpion in the garage, the laundry
room, or worse, on a bedroom wall. The most common question we get is simple: when does this
stop? Here is what the actual data shows, rather than the month-by-month “pest calendars”
that get copied between pest company blogs without a source behind them.
Scorpion stings peak in August and September
A review of eleven years of United States poison control data published in the Journal of Medical Toxicology
found that scorpion envenomations follow a clear seasonal curve, peaking nationally in August
and September. That same study found Arizona and Nevada were the top two states in the country
for scorpion exposure reports, with Arizona accounting for 68.2 percent and Nevada 4.2 percent
of cases.
The study also found something worth taking seriously if you have kids: children under ten
in Arizona and Nevada had the highest rates of systemic effects, hospitalization, and intensive
care admission. This is the reason we treat scorpions as a safety issue and not a nuisance
issue.
Why late summer is the worst window
Two things overlap in the Las Vegas Valley in late summer. Scorpion activity is already at
its annual high, and Southern Nevada’s monsoon season runs roughly July through September.
Local reporting by KTNV Las Vegas has documented pest control service calls climbing during that
window as heavy rain floods the valley’s wash system and pushes scorpions, cockroaches, and
rodents toward the dry interiors of buildings.
If you only do one thing differently this year, make sure your home is already under
treatment before the monsoon arrives rather than calling after the first sighting.
Scorpions do not disappear in winter
Bark scorpions do not migrate and they do not die off in the cold. They move into protected
harborage: block wall voids, weep holes, attics, garages, and wall cavities. A quiet winter
usually means the population has relocated inward, not that it has gone away. That is why
one-off summer treatments rarely solve the problem. The colony survives the winter inside the
structure and re-emerges in spring.
Which scorpion you actually have
The University of Nevada Cooperative Extension identifies the Arizona bark scorpion as the most venomous scorpion in
North America and the only species in Nevada considered seriously dangerous. It is small,
light tan or straw-coloured, and slender, with a very thin tail. The much larger, hairier
giant desert hairy scorpion looks far more alarming but is significantly less dangerous.
Two facts about bark scorpions drive everything we do on a treatment:
- They climb. Bark scorpions can climb stucco, block walls, and interior
drywall. This is why they turn up on ceilings and on second floors. A ground-level perimeter
spray alone will not keep them out. - They fluoresce. Under ultraviolet light they glow yellow-green. A real
scorpion inspection is done after dark with a blacklight. A daytime walkthrough will miss most
of what is on the property.
Where they hide on a Las Vegas property
Banner Health Poison Control notes that bark scorpions seek dark, damp places. On valley homes that means
pool equipment areas, irrigation valve boxes, laundry rooms, damp towels, shoes left in the
garage, and clothing left on the floor. Outdoors, they use landscape rock, block wall gaps,
wood piles, and the weep holes in stucco.
What actually reduces scorpion numbers
Chemistry alone is the weakest part of scorpion work. What moves the needle is exclusion:
- Sealing weep holes with stainless screen rather than caulk
- Fitting proper door sweeps on garage and exterior doors
- Sealing utility, cable, and plumbing penetrations
- Closing gaps at block wall caps and expansion joints
- Pulling landscape rock, wood piles, and dense ground cover away from the foundation
- Reducing the insect population scorpions feed on
Combined with regular service through the spring-to-autumn build, that is what produces a
lasting reduction. You can read more on our
scorpion control page, and see how the
problem differs by area on our
Summerlin,
Enterprise, and
Henderson pages.
Need help now? Ridtechs Pest Solutions is a locally owned, Nevada-licensed pest control company serving the entire Las Vegas Valley. Call (702) 540-0931 or request an inspection.