Foster City's median sale price was about $1.3 million in the three months through September 2026, down 23.1% from a year earlier on Redfin, while Zillow's typical-home value rose 2.1% to about $1.85 million.
The numbers
- Median sale price: about $1.3 million, down 23.1% year over year
- Price per square foot: about $814, down 16.1%
- Homes sold in September: 65, up from 58 a year earlier
- Median days on market: 25, unchanged from a year earlier
What Zillow shows
Zillow's Home Value Index puts the typical Foster City home at $1,845,821 as of Sept. 30, 2026, up 2.1% from a year earlier.
What it means for buyers and sellers
Redfin rates Foster City "somewhat competitive." Homes get about two offers on average and go pending in around 25 days. Some homes get multiple offers. The average home sells for about 2% above list, and hot homes go about 4% over in around 12 days. The big gap between Redfin's falling median and Zillow's rising index is a reminder that a median sale price depends on which homes happened to sell. A quarter heavy on condos and townhomes can pull it down even when values hold steady. Compare with San Mateo.
Redfin figures cover the three months through September 2026 and compare with the same period a year earlier. Zillow's Home Value Index is a typical-home estimate, not a sale price, so the two numbers measure different things and won't match exactly.