Weekly Mosquito and Tick Report

Northwest Mosquito Abatement District operates 35 mosquito traps throughout the 242 square miles we cover. These traps help track mosquito populations and West Nile virus. Traps run continuously from May 1 until October and mosquitoes are collected everyday Monday through Friday. All mosquitoes are identified to species. NWMAD tests certain mosquito species for the presence of West Nile virus. Read the weekly report on mosquito and tick populations in our district, written by NWMAD’s Entomologist Patrick Irwin, PhD, below.

WeekReport
Week 19 – May 4-10, 2026Week 19 Mosquito and Tick Report (PDF)
Week 20-May 11-17, 2026Week 20 Mosquito and Tick Report (PDF)
Week 21-May 25-31, 2026Week 21 Mosquito and Tick Report (PDF)
Week 22-June 1-7, 2026Week 22 Mosquito and Tick Report (PDF)
Week 23-June 8-14, 2026Week 23 Mosquito and Tick Report (PDF)

WeekReport
Week 20 – May 12-18, 2025Week 20 Mosquito and Tick Report (PDF)
Week 21 – May 19-25, 2025Week 21 Mosquito and Tick Report (PDF)
Week 22 – May 26 – June 1, 2025Week 22 Mosquito and Tick Report (PDF)
Week 23 – June 2-8, 2025Week 23 Mosquito and Tick Report (PDF)
Week 24 – June 9-15, 2025Week 24 Mosquito and Tick Report (PDF)
Week 25 – June 16- 22, 2025Week 25 Mosquito and Tick Report (PDF)
Week 26 – June 23-29, 2025Week 26 Mosquito and Tick Report (PDF)
Week 27 – June 30 – July 6, 2025Week 27 Mosquito and Tick Report (PDF)
Week 28 – July 7- 13, 2025 Week 28 Mosquito and Tick Report (PDF)
Week 29 – July 14-20, 2025Week 29 Mosquito and Tick Report (PDF)
Week 30 – July 21-27, 2025Week 30 Mosquito and Tick Report (PDF)
Week 31 – July 28-August 3, 2025Week 31 Mosquito and Tick Report (PDF)
Week 32 – August 4-10, 2025Week 32 Mosquito and Tick Report (PDF)
Week 33 – August 11-18, 2025Week 33 Mosquito and Tick Report (PDF)
Week 34 – August 19-24, 2025Week 34 Mosquito and Tick Report (PDF)
Week 35 – August 25-31, 2025Week 35 Mosquito and Tick Report (PDF)
Week 36 – September 1-7, 2025Week 36 Mosquito and Tick Report (PDF)
Week 37 – September 8-14, 2025Week 37 Mosquito and Tick Report (PDF)
Week 38 – September 15-21, 2025Week 38 Mosquito and Tick Report (PDF)
Week 39 – September 22-28, 2025Week 39 Mosquito and Tick Report (PDF)
Week 40 – September 29-October 5, 2025Week 40 Mosquito and Tick Report (PDF)