# Spider Season in Ontario — Spider Squad

## Ontario's Spider Calendar

Spider activity in Ontario follows a predictable seasonal pattern driven by temperature, breeding cycles, and the behaviour of insects (their food supply).

**Spring (April to May):** Egg sacs laid the previous fall begin to hatch. Overwintered adults become active. Populations start rebuilding. Most spiders are small and not yet visible to homeowners.

**Early summer (June to July):** Juvenile spiders grow rapidly. Insect populations peak, providing abundant food. Spider populations expand. Web activity increases on exterior structures.

**Late summer (August to September):** Peak spider season. Adult spiders reach full size. Orb weavers build their largest webs. Wolf spiders and house spiders mature. Egg sac production begins for many species.

**Fall (September to October):** The most alarming season for homeowners. Multiple factors combine: mature adult spiders are at maximum visibility, males of many species begin wandering in search of mates (wolf spiders and house spiders particularly), and cooling temperatures push outdoor spiders toward structures seeking warmth. This is when the "invasion" feeling peaks.

**Winter (November to March):** Most spiders overwinter as eggs or as adults in sheltered exterior zones (under bark, in wood piles, under siding, in wall voids). Indoor species remain active year-round in heated spaces but at reduced activity levels.

## Why Fall Feels Like an Invasion

Three things happen simultaneously in August to October:
1. Spiders that have been growing all summer reach adult size and maximum visibility
2. Male spiders begin wandering to find mates — they move more, appear in unexpected places, and are often seen in open areas rather than webs
3. Cooling temperatures cause outdoor spiders to move toward the warmth of structures

The actual population hasn't necessarily grown dramatically — the spiders you're seeing in September are largely the same ones that were there in July, now adult-sized and behaviorally different.

## Ontario Pest Pressure by Month

- **May:** Spring treatment optimal — ants, ticks (nymphs emerging), early spiders
- **June:** Mosquito pressure building; carpenter ant flights; spider populations growing
- **July:** Peak mosquito pressure; full spider activity; dock spiders highly visible
- **August:** Late summer spider peak begins; orb weavers prominent
- **September:** Fall spider season — maximum activity, indoor wandering; tick adults active
- **October:** Spiders seeking overwinter sites; last tick activity; ant colonies clustering

## Best Treatment Timing

For maximum impact, Spider Squad recommends:
- **Spring treatment (May):** Catch spiders before summer populations establish, address tick nymphs before their peak
- **Late summer treatment (August to early September):** Knock down the fall spider population before the peak wandering period

Customers who want year-round coverage enroll in the annual maintenance plan, which schedules these treatment windows automatically.

To book: call 905-935-7498 or request a quote at spidersquad.ca.