Why do potholes form in San Jose lots and driveways?
San Jose does not freeze like colder cities, so potholes here mostly come from water, traffic and base problems. Common causes include:
- Winter rain. Rain from about November to April finds cracks and soaks the base, and the first heavy storms often reveal weak spots.
- Open cracks. Cracks that were never filled let water in from above.
- Poor drainage. Low spots hold water and soften the ground beneath.
- Heavy loads. Delivery trucks, trash trucks and work vehicles break down weak areas.
- Utility trenches. Patches over old trenches settle and crack along the edges.
- Tree roots. Roots lift sections of pavement and open gaps.
Fixing the cause matters. If a pothole keeps coming back in the same place, there is usually a drainage or base problem under it.

