The Treasure Valley housing market held firm through September, with both counties continuing to see prices climb and homes sell faster than they did a year ago — even as transaction volume in Canyon County took a slight step back.
Ada County: Steady Gains Across the Board
Ada County recorded 854 single-family home sales in September, an 8.5% increase over the same month last year. The median sales price for existing homes came in at $575,000, up 2.9% year-over-year — holding at a level that reflects sustained demand without the runaway appreciation of prior cycles.
The standout number this month: average days on market dropped to 39 days, a 4.9% improvement over September 2025. Homes are continuing to move faster than last year, and available inventory remained at 2.4 months of supply — unchanged from August.
The takeaway: Ada County remains a consistent seller’s market. Volume is up, prices are appreciating, and well-priced homes are still moving quickly.
Canyon County: Prices Up, Pace Accelerates
Canyon County posted 419 single-family home sales in September — essentially flat year-over-year at -0.7%, a notable shift after several months of strong volume gains. That said, the price story is positive: the median sales price reached $443,523, up 5.1% from September 2025, the strongest year-over-year price gain of any month we’ve reported this year.
And homes are selling significantly faster. Average days on market fell to 48 days, a 15.8% drop year-over-year — the largest speed-to-sale improvement across both counties this month. Inventory held steady at 2.6 months of supply.
The takeaway: The slight dip in Canyon County sales volume isn’t a red flag — it reflects normal seasonal patterns. Prices are growing, and homes are selling faster than they were a year ago. The value proposition here remains strong.
What This Means for the Treasure Valley
September’s data reinforces a consistent theme throughout 2026: inventory is tight, prices are moving up, and buyer demand — while showing some seasonal moderation — hasn’t meaningfully softened. Both counties remain well below the 4–6 months of supply that defines a balanced market, and that supply constraint continues to support values heading into Q4.
If you’re weighing a move before year-end, the window to act strategically is now. Our team tracks these numbers every month so you have the local intelligence to make a confident decision.
Data provided by Intermountain Multiple Listing Service. Single-family residential resale homes only.
Frequently Asked Questions
Is the Treasure Valley housing market still active in September 2026? ▸
Yes. Ada and Canyon counties combined for 1,273 single-family home sales in September 2026, with prices rising in both counties and homes selling faster than they were a year ago.
What is the median home price in Ada County in September 2026? ▸
The median sales price for existing single-family homes in Ada County was $575,000 in September 2026, up 2.9% year-over-year, according to Boise Regional REALTORS® data.
What is the median home price in Canyon County in September 2026? ▸
The median sales price for existing single-family homes in Canyon County was $443,523 in September 2026, up 5.1% year-over-year — the strongest year-over-year price gain reported across both counties in 2026.
How many homes sold in Ada County in September 2026? ▸
Ada County recorded 854 single-family home sales in September 2026, an 8.5% increase over September 2025.
How many homes sold in Canyon County in September 2026? ▸
Canyon County recorded 419 single-family home sales in September 2026, essentially flat compared to September 2025 (-0.7%), reflecting normal seasonal patterns rather than a market shift.
How long does it take to sell a home in Ada County right now? ▸
Homes in Ada County averaged 39 days on market in September 2026, down 4.9% from September 2025 — continuing a trend of faster sales that has held throughout 2026.
How long does it take to sell a home in Canyon County right now? ▸
Homes in Canyon County averaged 48 days on market in September 2026, down 15.8% from the same month last year — the largest speed-to-sale improvement across both counties this month.
How much housing inventory is available in the Treasure Valley? ▸
As of September 2026, Ada County has 2.4 months of available inventory and Canyon County has 2.6 months — both well below the 4–6 months typically associated with a balanced market.
Is it a buyer’s or seller’s market in the Treasure Valley in September 2026? ▸
The market continues to favor sellers. With inventory below 3 months in both counties and homes selling faster than a year ago, well-priced listings are still moving with strong results.
Where is the most affordable place to buy a home in the Treasure Valley? ▸
Canyon County remains the most affordable option in the Treasure Valley, with a median resale price of $443,523 in September 2026 — compared to $575,000 in Ada County.
Should I sell my home in the Treasure Valley this fall? ▸
September data supports selling before year-end. Inventory is tight, prices are appreciating in both counties, and homes are selling faster than they were a year ago — conditions that favor well-prepared sellers heading into Q4.
Are home prices still rising in the Treasure Valley in 2026? ▸
Yes. In September 2026, median prices rose 2.9% year-over-year in Ada County and 5.1% in Canyon County, continuing a steady appreciation trend across the Treasure Valley throughout 2026.