Foster City, CA vs Sierra Madre, CA

The cost of living difference between Foster City, CA and Sierra Madre, CA is dramatic. Sierra Madre is 46.7% cheaper than Foster City, a gap that translates to thousands of dollars per year in household expenses. Foster City has a cost index of 293 while Sierra Madre sits at 200, making this one of the more striking comparisons on our site. Relocating between these cities would require a serious reassessment of budget and lifestyle expectations.

On the housing front, median rent in Foster City is $3,501/month compared to $2,086/month in Sierra Madre — a 68% difference. Home values follow the same pattern: Sierra Madre is more affordable at $1,172,200 median vs $1,774,500.

Median household income in Foster City is $193,633 compared to $141,094 in Sierra Madre (+37.2%). The higher salaries in Foster City partially offset the cost difference, but don't fully close the gap. Looking at affordability, residents of Foster City spend roughly 21.7% of their income on rent, more than the 17.7% in Sierra Madre.

Climate-wise, Sierra Madre is notably warmer with an average of 65.8°F compared to 58.7°F in Foster City. Foster City receives more rainfall at 19.6" per year compared to 14.3" in Sierra Madre.