Castro Valley's median sale price was about $1.14 million in the three months through September 2026, roughly flat, but homes sold in 16 days, down from 27.
The numbers
- Median sale price: $1,137,958, down 0.66% year over year
- Price per square foot: about $673, up 1.6%
- Homes sold in September: 113, down from 158 a year earlier (down 28.6%)
- Median days on market: 16, down from 27
- Sale-to-list ratio: 103.7%, up 4.1 points; 58.6% of homes sold above list
- Homes with price drops: 24.3%, down 8.7 points
What Zillow shows
Zillow's Home Value Index puts the typical Castro Valley home at $1,088,972 as of Sept. 30, 2026, up 1.2% from a year earlier. Zillow says homes go pending in about 17 days.
What it means for buyers and sellers
Redfin gives Castro Valley a Compete Score of 88, "very competitive." Homes get about four offers, the average home sells for about 4% over list, and hot homes go for about 9% over in around 11 days. Prices are flat, but far fewer homes sold, homes sold faster and price cuts fell, which points to tight supply rather than weak demand. See next door in our Hayward and San Leandro reports.
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.