MetroWest Homeowner Field Guide: Ant Activity and Entry Points

1. Record the first location

• Room or exterior area
• Surface or structure
• Distance from food
• Distance from moisture
• Nearby door, window, pipe, cable, or crack
• Date first observed

2. Follow the pattern

• Is there a visible trail?
• Does the trail lead toward a wall or opening?
• Does activity stop after cleaning and then return?
• Is activity strongest at a particular time?
• Are ants present in more than one room?
• Is outdoor activity visible near the same wall?

3. Describe the ants

• Approximate size
• Color
• Winged or unwinged
• One size or several sizes
• Slow or fast movement
• Strong odor when crushed, if incidentally noticed
• Photograph available

Do not intentionally crush, handle, or disturb unknown insects solely for identification.

4. Check food and moisture conditions

• Open food
• Crumbs or grease
• Pet food
• Trash or recycling
• Leaking plumbing
• Condensation
• Damp wood
• Plant moisture
• Exterior vegetation touching the structure

5. Check possible entry areas

• Window frames
• Door thresholds
• Foundation cracks
• Utility penetrations
• Siding gaps
• Deck connections
• Roof or gutter areas
• Damaged caulk
• Damp wood

6. Winged insects

Winged ants may emerge during reproductive activity and can be mistaken for termite swarmers. Photograph the insects and the location where they appeared. Do not rely on an internet image alone when structural insects are a concern.

7. When professional evaluation may help

• Repeated indoor trails
• Activity in several rooms
• Winged insects indoors
• Activity connected to damp or damaged wood
• Recurrence after previous attempts
• Uncertain identification
• Activity near electrical or inaccessible areas