The Short Answer: Start Before Peak Season
The best time to begin mosquito treatment is before mosquito populations reach their seasonal peak — not after you are already getting bitten. For most of the US, this means starting in May. Waiting until June or July means treating an already-established population rather than preventing buildup.
Mosquito Season by Region
| Region | Active Season | First Treatment |
|---|---|---|
| Deep South (FL, LA, TX coast) | Year-round | February-March |
| Southeast (GA, SC, NC, TN, AL) | March-November | March-April |
| Mid-Atlantic & Midwest | May-September | April-May |
| Northeast | June-September | May-June |
| West / Pacific Northwest | Variable | May or after first warm spell |
What to Address Before the First Treatment
Professional barrier spray kills adult mosquitoes in vegetation. But the most effective mosquito control also addresses the breeding sources that produce new mosquitoes every week. Before calling for treatment, do a thorough standing water elimination walk of your property:
- Clean gutters completely — clogged gutters are the most overlooked residential breeding site
- Empty and refresh bird baths weekly
- Store or overturn any container that collects water — buckets, tarps, toys, flower pot saucers
- Fill low spots in the yard that hold water after rain
- Treat ornamental ponds with BTi mosquito dunks
How Often to Treat
A single professional barrier spray treatment provides 21-30 days of residual protection. For consistent protection through mosquito season, monthly treatments from first-season through October are the most effective program. Events or special occasions can be treated 24-48 hours before the event for best protection during the event period.
✓ Combine professional barrier spray with standing water elimination and outdoor fans in seating areas for maximum mosquito reduction. Mosquitoes are weak fliers and avoid areas with airflow above 1 mph.