When is the best time to see processionary caterpillars active around Mallorca?

Processionary caterpillars typically emerge and move in their distinctive lines during the spring months, primarily from late March to early June. On the island, they are often found near oak groves scattered across the Serra de Tramuntana and rural areas around towns like Valldemossa and Pollença, where their favourite food — oak leaves — is plentiful. The mild temperatures and higher humidity of spring create optimal conditions for their feeding and growth.

As the season progresses towards summer, the caterpillars mature and pupate, making sightings less common. Local microclimates can shift the timing slightly; for example, higher elevations along the Ma-10 route through the Tramuntana might experience delays in caterpillar activity. If you’re keen to observe these intriguing creatures, a spring visit offers the best opportunity, but it’s wise to admire them from a distance since their hairs can cause skin irritation. Avoid touching or disturbing nests near hiking paths or countryside roads, especially during the height of their procession.

For nature enthusiasts exploring around Sóller or Alcúdia, spring walks can reveal these fascinating insects crossing trails, adding an unexpected wildlife highlight to the stunning coastal and mountainous landscapes.