Can Cockroaches Survive Winter in Spain?

If you’ve arrived in Spain during winter and haven’t seen a single cockroach, you might be wondering what all the fuss is about. Or maybe you’ve been through a difficult summer and are hoping that winter will solve the problem permanently.

The truth is somewhere in between. Winter reduces cockroach activity dramatically, but it doesn’t eliminate them.

Where Do Cockroaches Go in Winter?

Spanish cockroaches don’t die off in winter the way some insects do. The coastal and southern regions simply don’t get cold enough for long enough to kill them. Instead, they adapt:

The sewer system stays warm. Underground sewers maintain temperatures of 15–20°C year-round, regardless of what’s happening on the surface. For American and Oriental cockroaches — the sewer-dwelling species — winter barely registers. They remain active below ground, just with less reason to venture upward since surface temperatures are less inviting.

Wall cavities and voids provide shelter. Cockroaches retreat deeper into the building fabric — inside walls, behind insulation, in void spaces around hot water pipes. They’re not gone; they’re just less visible.

Indoor species are largely unaffected. German cockroaches live in your kitchen, not outside. As long as your home is heated and there’s food and water, they remain active year-round. If you’re seeing small cockroaches in your kitchen in December, winter is not going to solve it.

How Does Each Species Handle Winter?

Do American Cockroaches Survive Winter?

The large sewer cockroach becomes much less visible in homes during winter. Reduced metabolism means less foraging, less flying, and less reason to leave the relatively warm sewer. You’ll see far fewer emerging from drains in December than in July.

But they’re still there. A warm spell in January, or an unusually heated bathroom, can trigger a visit.

Do German Cockroaches Survive Winter?

The German cockroach lives behind your fridge. Your fridge generates heat. Your kitchen has food and water. The outside temperature is irrelevant to this species. If you had German cockroaches in October, you still have them in February — possibly with fewer visible adults as reproduction slows slightly, but the colony persists.

Do Oriental Cockroaches Survive Winter?

Oriental cockroaches are the most cold-sensitive of the common Spanish species. They genuinely slow down in winter and you may see very few between November and March, particularly in properties at altitude or in northern Spain. But on the mild coast, even they persist.

Why Is Winter Your Best Prevention Window?

Winter is actually the ideal time to do the work that keeps cockroaches out during summer:

Physical barriers. Install drain covers, seal pipe gaps with silicone, fit window screens. Doing this in December means you’re ready before the spring ramp-up. There’s no urgency, no heat, and no cockroaches running across your feet while you work.

Deep cleaning. Pull out the fridge, clean behind the oven, empty and clean kitchen cabinets. Remove any egg cases you find. These harbourage areas are where German cockroach colonies survive the winter.

Treatment. Late winter (February–March) is the prime treatment window. Apply gel bait behind the fridge, under the sink, and in bathroom cabinets. The cockroach population is at its annual low, so a single application has outsized impact. See our fumigation timing guide for the full seasonal calendar.

Building maintenance. Ask your comunidad to schedule professional treatment of communal areas for early spring. Getting it on the agenda during winter means it happens before the busy season.

How Does Winter Cockroach Activity Vary by Region?

Winter cockroach behaviour varies significantly across Spain:

Costa del Sol / Southern coast: Mild winters (12–18°C daytime) mean cockroach activity merely reduces rather than stops. Sewer cockroaches remain somewhat active. A warm February week can trigger early-season encounters.

Madrid / Central plateau: Colder winters (2–10°C daytime, below freezing overnight) suppress outdoor cockroach activity much more effectively. However, heated apartments maintain German cockroach colonies year-round.

Barcelona / Northeast coast: Similar to the south but slightly cooler. Cockroach activity in winter is noticeably lower than in Málaga but doesn’t disappear.

Northern Spain (Bilbao, Santiago): The coolest and dampest climate. Cockroach populations are naturally lower year-round, and winter further suppresses them. But Oriental cockroaches in damp basements can persist.

Canary Islands: Virtually no winter suppression. Year-round warm temperatures mean cockroach activity barely changes between seasons. Ongoing prevention is essential.

The Bottom Line

Cockroaches in Spain survive winter — they don’t thrive in it. This is your advantage. Use the quiet months to seal entry points, deep clean harbourage areas, and apply preventive treatment. The work you do between November and March determines how your summer goes.

Don’t mistake reduced visibility for absence. The colonies are still there, they’re just waiting for the warmth to return. Get ahead of them while they’re slow, and spring will be a very different experience.

For the complete prevention and treatment protocol, see our cockroach guide.