Here is the month in one paragraph: Williamson County closed September with a median sale price of $950,000 and roughly 400 closings, up about 7% from a year ago, but the homes that sold took longer to sell, averaging 41 days on market, and months of supply climbed to the low 5s, the loosest this county has been all year. Layer on a 30-year mortgage rate that crossed 7% in late September for the first time since January 2025 and kept climbing into October, and you get a market where well-priced homes still close at strong numbers while overpriced ones sit. Prices are holding. Leverage is shifting. This is buyer-leaning right now, and pretending otherwise is how sellers chase the market down.
All figures below are from September 2026 closings, the most recent full month of reporting as of this late-October update, drawn primarily from Realtracs MLS data as compiled by local brokerages. Early-month MLS figures are preliminary and can revise slightly.
What I'm seeing on the ground matches the data with one addition the spreadsheets miss: buyers are showing up prepared and unhurried. They've done their research, they know what comparable homes closed for, and they're comfortable walking away from anything that feels priced for 2024. The sellers winning right now are the ones who treat the first fourteen days on market as the whole game.
The Numbers That Matter This Month
The takeaway: prices are flat-to-firm, but pace and supply have moved decisively in buyers' favor. Williamson County has gone from about 4 months of supply in June to more than 5 in September.
The September 2026 county-wide figures, as of early-October reporting:
- Median sale price: $950,000. The average sale price came in near $1.29 million, a gap that tells you how much seven-figure activity this county carries.
- Closings: 404, up 7% year over year per one Realtracs-based county report; a separate preliminary tally put it at 397. Either way, demand did not fall off. It held above last September while most of Middle Tennessee slipped.
- Average days on market: 41. Homes are taking meaningfully longer to sell than the mid-20s-to-30s pace sellers got used to.
- Active inventory: up 15% year over year; months of supply at roughly 5.2 to 5.3. The trajectory matters more than the level: supply ran 4.01 months in June, 4.59 in July, 5.18 in August, and 5.33 in September. That's four straight months of loosening.
- Rates: the Freddie Mac 30-year average hit 7.03% the week of September 24, crossed to 7.28% by October 1, and reached 7.40% by mid-October, the highest readings in well over a year.
For context, the broader nine-county Greater Nashville region posted a $469,000 median with closings down 2% year over year and 5.28 months of supply. Williamson County is outperforming its region on demand (closings rose here while they fell regionally), but it is not immune to the supply build.
Town by Town
The takeaway: this is not one market. Nolensville tightened dramatically in September while Brentwood softened, and Franklin sits in between. Pricing a home off the county average is a mistake in any of them.
Franklin. Redfin's figures for the three months ending September 30 put Franklin's median sale price at $863,089, up 12.8% year over year, with a median 55 days on market and homes closing at an average of 98.1% of list price, against 569 active listings. That year-over-year price jump should be read with care: mix shifts (more high-end closings in the window) can inflate a three-month median. The honest Franklin read: healthy pricing, more selection than buyers have had in years, and nearly two months of patience required from sellers.
Brentwood. Brentwood is the county's clearest soft spot this month. Redfin's trailing-three-month median came in at $1,349,357, down 3.6% year over year, with 61 median days on market and sales averaging 97.0% of list, meaning the typical Brentwood seller is conceding roughly 3% off asking. Because nearly everything in Brentwood is effectively a luxury listing, this is really a read on the upper tier itself. More on that below.
Nolensville. Nolensville was September's outlier, in the good way. The Williamson County portion of Nolensville recorded 42 closings, more than double September 2025, with a median of $970,000 (up 3%), an average of 24 days on market (down from 35 a year ago), and months of supply falling to 3.1, down from 5.98 a year earlier. Eighteen of those 42 closings were at $1 million or more. By the county's own standards, Nolensville leaned toward sellers in September even as the county overall leaned the other way.
Thompson's Station. Thompson's Station data is thinner and the published figures vary by method, so I'll hedge rather than pick a number: Zillow's typical home value sat near $732,000 (up about 1% year over year) as of its most recent mid-2026 reporting , while a trailing-12-month tally of closed sales put the median sold price around $900,000, the gap reflecting how much new construction and large-lot product skews what actually closes here. The practical read: values are roughly flat, and the spread between entry product and estate product is wide enough that town-level medians tell you little about your specific street.
The Luxury Segment
The takeaway: the $1M+ tier carried this market's price growth all year, and it's now the tier softening fastest. Luxury sellers have less pricing room than the county's headline numbers suggest.
The structural picture first: Williamson County's September average sale price of roughly $1.29 million against a $950,000 median confirms how much of this market's dollar volume lives above $1 million. Across Middle Tennessee, the gap between average and median sale price widened to about $188,000 in September from $164,000 a year earlier, so remaining price growth is concentrated in the upper tier. But the same regional analysis is blunt about the direction: the upper price ranges that carried growth all year are now softening fastest, with the regional average falling 2.3% from July to September versus a 1.4% drop over those months last year.
You can see both sides of that in the town data. Brentwood, the county's most concentrated $1M+ market, posted a negative year-over-year median and two months of market time. Meanwhile Nolensville closed six homes at $1.5 million or more in a single month, topping out just under $2.9 million. Luxury demand hasn't vanished; it has gotten selective. Jumbo buyers at 7%+ rates, and the meaningful share who pay cash precisely because rates are high, are rewarding turn-key condition and realistic pricing, and discounting everything else.
What This Means If You're Selling
The takeaway: you can still command a strong price in this market, but only if you price to the last 90 days of comparable sales, not to your neighbor's 2024 closing.
With county supply above five months and average market time at 41 days, the leverage you had two years ago is gone. What you still have is a median that's holding and buyer traffic that's real. The sellers getting clean contracts right now share three habits: they price at or slightly below the most recent comparable closings, they present turn-key (the luxury buyer pool at these rates will not absorb a project), and they treat the first two weeks as the entire marketing window. The showing activity you get in days 1 to 14 is the best you will ever get. If you're above $1 million, be especially sober: that's the tier where the data shows softening, and a 5 to 8% overprice in this environment doesn't just cost you time, it costs you the eventual sale price when you reduce into a stale listing. Budget mentally for negotiation, too: Brentwood sellers averaged 97% of list in the latest reporting.
What This Means If You're Buying
The takeaway: your negotiating position is the strongest it has been all year, but the payment math at 7.4% means leverage is best spent on concessions and rate buydowns, not just price.
Inventory is up 15% year over year, homes are sitting 41 days on average, and sellers know it. On listings past the 45 to 60 day mark, it is entirely reasonable to ask for price, closing costs, and a rate buydown in the same offer. The caution: waiting hasn't actually made homes cheaper to own. Regionally, the median price eased over the summer while rates climbed from the mid-6s to 7.4%: the house got cheaper and the payment got more expensive. And as Nolensville's September showed, some pockets are still genuinely competitive; town selection matters more than timing right now. If you find the right house, negotiate hard on this one rather than waiting for a better market that may not arrive on your schedule.
The Bottom Line
Williamson County in October 2026 is a firm-price, slow-pace, rising-supply market: a $950,000 median that's holding, 41 days of average market time, five-plus months of supply, and mortgage rates at their highest level since early 2025. That mix favors prepared buyers and punishes wishful pricing, and it rewards anyone, on either side, who works from current data instead of last year's headlines.
If you're weighing a sale, start with a real number: request a professional valuation and I'll run your home against the actual September and October closings in your neighborhood, not a county-wide average. If you're buying, or just want a straight answer about what this market means for your situation, reach out directly. I'll be back next month with the October closings data.