Current Diamond Bar median home price: $1,003,996
| Date | Average price (≈) | Minimum price (⇓) | Maximum price (⇑) |
|---|---|---|---|
| 2025 September | $1,014,863 | $913,377 | $1,116,350 |
| 2025 October | $1,021,083 | $918,974 | $1,123,191 |
| 2025 November | $1,027,340 | $924,606 | $1,130,074 |
| 2025 December | $1,033,636 | $930,272 | $1,137,000 |