Short answer: In Phoenix, Las Vegas and Tucson, scorpions are active from roughly spring through fall, once nights stay warm. Activity peaks in the hottest months, about June through September. In winter they hide in walls and under debris, often in groups.
The year at a glance
| Months | What scorpions are doing | What to do |
|---|---|---|
| Dec–Feb | Mostly hiding, often grouped together | Best time to seal |
| Mar–May | Coming out as nights warm | Finish sealing, clear the yard |
| Jun–Sep | Peak activity, plus monsoon storms | Check with a blacklight, treat outdoors |
| Oct–Nov | Slowing down as nights cool | Re-check seals before winter |
Why winter is the time to seal
Searches for scorpion help in Phoenix more than double in July, August and September compared with winter. Companies are busiest then, too. Sealing in the cool months gets the work done before scorpions are moving and while companies have openings.
By city
- Phoenix and Scottsdale: long season, heaviest in summer
- Tucson: similar, with a burst during monsoon
- Las Vegas: a slightly shorter season, peaking in midsummer
- San Antonio: striped bark scorpions active spring through fall
Common questions
Do scorpions die in winter?
No. They slow down and hide in walls, under debris and in other sheltered spots, often in groups.
What temperature brings scorpions out?
They become active as nights warm up in spring and stay active through the hot months.