Ant Season Is Kicking Off

March is when things wake up.

The rain slows down, the soil starts warming up here in the East Bay, and pests that have been quiet all winter suddenly get active. If you’re a homeowner, this is the month you either stay ahead of it… or start reacting to it.

Here’s what March 2026 really means.

As temperatures consistently rise, ants start foraging hard.

In Contra Costa and Alameda counties, Argentine ants are usually the first to show up. You’ll see:

  • Trails along baseboards

  • Ants in sinks and bathrooms

  • Activity near pet bowls

  • Lines coming through tiny foundation cracks

What most people don’t realize is this: by the time you see the trail, the colony is already established and expanding.

March is when colonies start splitting and forming new satellite nests. That’s why treating early matters. Waiting until May usually means you’re chasing multiple nests instead of preventing them.

brown ants eating bait on a tan wall

Fleas Start Rebuilding Outdoors

Flea eggs survive winter in shaded soil, under decks, and in crawlspaces. Once the ground warms up, they hatch fast.

March is when:

  • Yard populations begin building

  • Wildlife like raccoons and stray cats drop new flea eggs

  • Dogs and indoor pets start bringing them inside

The flea life cycle can explode quickly once temperatures stay above 60 degrees. One untreated yard can turn into a full indoor problem by late spring.

Early yard treatment in March interrupts the cycle before it multiplies.

Termite Swarm Season Begins

two types of termite next to each other

This is the big one.

March is the start of termite swarm season in California.

On warm days after rain, reproductive termites leave the colony to start new ones. Homeowners usually notice:

  • Swarmers around windows

  • Wings on window sills

  • Mud tubes along foundations

  • Tiny piles of wings near doors

Swarming does not mean they just arrived. It means the colony has matured and is reproducing.

Catching it early can mean localized treatment instead of structural repair later.

Why March Matters

This month is about prevention instead of reaction.

  • Ant colonies are building

  • Fleas are hatching

  • Termites are reproducing

By late April, those small warning signs turn into real infestations.

If you’re in the East Bay and you’re already seeing activity, this is the time to get ahead of it. A proactive inspection in March is always cheaper than emergency treatment in June.

Spring is when pests move.
You can either wait for them to settle in, or stop them at the door.

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