Winterizing Your Minnesota Home Against Pests This Fall

Minnesotans winterize everything: the sprinklers get blown out, the dock comes in, the furnace gets its checkup. Add one more system to the list, because the mice, spiders, and overwintering insects you’ll find in January are getting inside right now, in October, while the getting is good. Pest-proofing is a fall chore with a deadline: the first stretch of hard frosts.

Who’s trying to move in

Four main groups make the push each fall in the metro. Mice, as soon as nights hit the 30s. Boxelder bugs and Asian lady beetles, massing on sunny siding in late September and October. Wolf spiders and crickets, drifting toward foundation warmth. And squirrels, checking your roofline for a winter den, which is a louder problem than most people expect.

The exterior walk-around

Take an hour on a Saturday and circle the house slowly with a caulk gun and a critical eye:

• Where siding meets foundation: seal gaps with silicone; stuff larger openings with copper mesh first
• Utility penetrations: AC lines, gas lines, cable, dryer vents. Gaps around these are mouse superhighways; make sure vent flaps close and add rodent screens
• Garage door: do the daylight test at the bottom seal and corners, and replace a flattened astragal
• Door sweeps on every exterior door; if a pencil slides under, so does a mouse eventually
• Window wells, basement window frames, and torn screens
• Roofline: gaps at soffit corners and fascia, and tree limbs within jumping distance for squirrels
• Firewood: stack it away from the house, not against the siding

Inside moves that matter

Get birdseed and pet food into gasketed containers; a bag of black oil sunflower seed on the garage floor is a mouse retirement plan. Declutter the storage room so any rodent activity is visible early, and set a couple of monitor traps in the garage and utility room as an alarm system.

The timing caveat

Here’s the honest wrinkle: exclusion work done after pests are inside can seal them in with you. If you’ve already heard scratching or found droppings, trap first, seal second. And for the overwintering insects like boxelder bugs, exterior treatments only pay off before the October flights; by November that window has closed until next year.

Where a professional fits

We do fall exclusion inspections all over the Twin Cities, and the value is mostly in trained eyes: we find the gaps homeowners walk past, up high, behind shrubs, under decks. A preventive exterior treatment in September pairs well with the sealing work for insect pressure.

Book the inspection before the freeze does your scheduling for you. It’s free anywhere in the metro, call Ankora at (651) 556-2666.