Pest control in Mount Vernon, IL

Pest season in Mount Vernon

NOAA's 1991–2020 climate normals for the MT VERNON 3 NE, IL station (about 5 miles away) show an average temperature of 54.5°F, about 45 inches of precipitation a year spread over roughly 74 days with measurable rain or snow, 108 nights at or below freezing and 21 days reaching 90°F or more. Monthly averages are at or above 50°F for 7 months, so insect activity is concentrated in a clear warm season, while 108 freezing nights a year push mice and some insects to look for shelter indoors. Average temperatures are at or above 50°F from about April through October.

Moisture and pests

At about 45 inches a year, Mount Vernon is wet by national standards. Damp soil, gutters and crawl spaces favor subterranean termites, mosquitoes breeding in standing water, and moisture-loving pests such as cockroaches, silverfish and carpenter ants in water-damaged wood.

Homes and pest entry points

The median year built for housing in Mount Vernon is 1968, and about 71% of its 7,131 housing units were built before 1980. Homes from this era often have settled foundations, aging weatherstripping and wood trim that can let pests in, and many have crawl spaces or basements worth checking for moisture. About 26% of housing units are in buildings with two or more units, where cockroaches and bed bugs can move between neighboring homes through shared walls and plumbing.

Services most relevant in Mount Vernon

• Termite Controlmedian home built in 1968, with older wood framing
• Rodent Controlabout 108 freezing nights a year push mice indoors
• Bed Bug Treatment26% of homes in multi-unit buildings
• Cockroach Controlshared walls and plumbing in multi-unit buildings
• Mosquito Control45 in of precipitation and 76°F in the warmest month
• Ant Controlabout 7 months a year average 50°F or more
• General Pest Controlone call when you are not sure what the pest is

Owners, landlords and tenants

About 53% of occupied homes in Mount Vernon are owner-occupied and 47% are rented. Homeowners, landlords and property managers can call to be connected; tenants should usually report pest problems to their landlord or property manager first, since leases and local rules often make treatment their responsibility.

Nearby places

Mount Vernon is in Jefferson County. Places within about 30 miles include Centralia (18 mi), West Frankfort (29 mi), Salem (22 mi), Benton (21 mi) and Du Quoin (28 mi).

Sources: Census Bureau Vintage 2025 estimate (July 1, 2025) for population; American Community Survey 2020–2024 5-year (tables B25003, B25024, B25034, B25035); 2024 Gazetteer; NOAA NCEI U.S. Climate Normals 1991–2020 (annual and monthly).