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Understanding Mosquitoes in Northern Colorado
West Nile Virus Risk
Northern Colorado consistently reports some of the state’s highest West Nile virus activity. The Culex mosquitoes that spread it are most active at dusk and dawn from midsummer into early fall, so cutting down bites during those hours protects your family’s health, not just their comfort.
Standing Water Breeding Sites
A mosquito needs only a bottle cap of water to lay eggs. Clogged gutters, plant saucers, birdbaths, tarps, old tires, and low spots that catch irrigation runoff all become nurseries. The ditches, ponds, and irrigated yards common across Weld and Larimer County make this a constant challenge here.
Daytime Biters
Not every mosquito waits for dusk. Aggressive floodwater species hatch in big numbers after heavy rain or a round of irrigation, and they will bite right through the afternoon, chasing you off your patio in broad daylight.
Shaded Resting Spots
Between meals, mosquitoes rest in cool, humid places like dense shrubs, tall grass, the space under decks, and along fence lines. These resting areas are exactly where our treatments do the most work, knocking down adults where they hide.
A Long Colorado Season
Mosquito pressure builds after spring runoff and the start of irrigation, peaks through the heat of July and August, and does’t fully let up until the first hard freeze. That long season is why one-off spraying rarely keeps up.
